Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n
Ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean l\u00e0 m\u1ed9t trong nh\u1eefng b\u00e0i to\u00e1n c\u01a1 b\u1ea3n. Nh\u01b0ng d\u1ec5 g\u00e2y nh\u1ea7m l\u1eabn. V\u00ec v\u1eady, c\u1ea7n v\u00f4 c\u00f9ng c\u1ea9n th\u1eadn trong vi\u1ec7c h\u1ecdc ki\u1ebfn th\u1ee9c l\u00fd thuy\u1ebft. C\u0169ng nh\u01b0 ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp.<\/p>\n\n\n\n
Ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean l\u00e0 d\u1ea1ng b\u00e0i t\u1eadp c\u0103n b\u1ea3n v\u00e0 g\u1ea7n gi\u1ed1ng v\u1edbi B\u00e0i t\u1eadp ph\u00e9p c\u1ed9ng hai s\u1ed1 nguy\u00ean tr\u00e1i d\u1ea5u.<\/p>\n\n\n\n
Quy t\u1eafc ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean<\/p>\n\n\n\n
Quy t\u1eafc<\/p>\n\n\n\n
Mu\u1ed1n tr\u1eeb hai s\u1ed1 nguy\u00ean, \u0111\u1ed1i v\u1edbi c\u1ea3 hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u v\u00e0 kh\u00e1c d\u1ea5u. Ta c\u00f3 quy t\u1eafc sau: Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng s\u1ed1 nguy\u00ean a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a s\u1ed1 nguy\u00ean b. T\u1eeb \u0111\u00f3, k\u1ebft qu\u1ea3 t\u00ecm \u0111\u01b0\u1ee3c l\u00e0 hi\u1ec7u c\u1ee7a s\u1ed1 nguy\u00ean a v\u00e0 b.<\/p>\n\n\n\n
Nh\u01b0 v\u1eady, c\u1ee5 th\u1ec3 h\u01a1n, ta c\u00f3 th\u1ec3 ph\u00e1t bi\u1ec3u th\u00e0nh c\u00f4ng th\u1ee9c nh\u01b0 sau:<\/p>\n\n\n\n
a \u2013 b = a + (-b)<\/p>\n\n\n\n
Quy t\u1eafc ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean<\/p>\n\n\n\n
L\u01b0u \u00fd ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean<\/p>\n\n\n\n
N\u1ebfu x = a \u2013 b<\/p>\n\n\n\n
Ta c\u00f3: a = a + [(-b) + b]<\/p>\n\n\n\n
a = [a + (-b)] + b<\/p>\n\n\n\n
a = (a \u2013 b) + b<\/p>\n\n\n\n
a = x + b<\/p>\n\n\n\n
Ng\u01b0\u1ee3c l\u1ea1i, n\u1ebfu a = x + b th\u00ec x = a \u2013 b.<\/p>\n\n\n\n
Ta c\u00f3: x = x + [(-b) + b]<\/p>\n\n\n\n
x = (x + b) + (-b)<\/p>\n\n\n\n
x = a + (-b)<\/p>\n\n\n\n
x = a \u2013 b<\/p>\n\n\n\n
L\u01b0u \u00fd ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean<\/p>\n\n\n\n
Nh\u1eadn x\u00e9t<\/p>\n\n\n\n
N\u1ebfu trong N, ph\u00e9p tr\u1eeb a cho b ch\u1ec9 t\u1ed3n t\u1ea1i v\u00e0 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c khi th\u1ecfa m\u00e3n \u0111i\u1ec1u ki\u1ec7n a \u2265 b. Th\u00ec \u0111\u1ed1i v\u1edbi t\u1eadp h\u1ee3p s\u1ed1 nguy\u00ean Z, ph\u00e9p tr\u1eeb a cho b lu\u00f4n t\u1ed3n t\u1ea1i v\u00e0 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c ngay c\u1ea3 khi a < b.<\/p>\n\n\n\n
Nh\u1eadn x\u00e9t v\u1ec1 ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean<\/p>\n\n\n\n
B\u00e0i t\u1eadp ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean<\/p>\n\n\n\n
V\u1ec1 t\u1ed5ng h\u1ee3p c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1ec1 ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean. C\u0169ng c\u00f3 m\u1ed9t s\u1ed1 d\u1ea1ng b\u00e0i c\u01a1 b\u1ea3n nh\u01b0 \u0111\u1ed1i v\u1edbi Ph\u00e9p c\u1ed9ng hai s\u1ed1 nguy\u00ean tr\u00e1i d\u1ea5u. Ba m\u1eb9 v\u00e0 c\u00e1c con c\u00f3 th\u1ec3 tham kh\u1ea3o th\u00eam t\u1ea1i b\u00e0i vi\u1ebft T\u1ed5ng h\u1ee3p l\u00fd thuy\u1ebft to\u00e1n l\u1edbp 6: C\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u<\/p>\n\n\n\n
B\u00e0i t\u1eadp luy\u1ec7n t\u1eadp ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean<\/p>\n\n\n\n
B\u00e0i 1.T\u00ednh:<\/p>\n\n\n\n
8 \u2013 32; 10 \u2013 (-9); (-352) \u2013 466; (-311) \u2013 (-489).<\/p>\n\n\n\n
B\u00e0i 2. T\u00ednh<\/p>\n\n\n\n
0 \u2013 67 = ?; 76 \u2013 0 = ?; d \u2013 0 = ?; 0 \u2013 d = ?.<\/p>\n\n\n\n
B\u00e0i 3. \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng:<\/p>\n\n\n\n
a 689 19233<\/p>\n\n\n\n
-a -353 -8<\/p>\n\n\n\n
2.2. G\u1ee3i \u00fd l\u1eddi gi\u1ea3i<\/p>\n\n\n\n
B\u00e0i 1:<\/p>\n\n\n\n
8 \u2013 32 = -24<\/p>\n\n\n\n
10 \u2013 (-9) = 19<\/p>\n\n\n\n
(-352) \u2013 466 = -818<\/p>\n\n\n\n
(-311) \u2013 (-489) = 178<\/p>\n\n\n\n
B\u00e0i 2:<\/p>\n\n\n\n
0 \u2013 67 = -67<\/p>\n\n\n\n
76 \u2013 0 = 76<\/p>\n\n\n\n
d \u2013 0 = d<\/p>\n\n\n\n
0 \u2013 d = \u2013 d<\/p>\n\n\n\n
B\u00e0i 3. \u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng:<\/p>\n\n\n\n
a 689 353 8 19233<\/p>\n\n\n\n
-a \u2013 689 -353 -8 -19233<\/p>\n\n\n\n
Gi\u1ea3i b\u00e0i t\u1eadp s\u00e1ch gi\u00e1o khoa<\/p>\n\n\n\n
B\u00e0i 47 (trang 82 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n
Gi\u1ea3i b\u00e0i t\u1eadp s\u00e1ch gi\u00e1o khoa<\/p>\n\n\n\n
B\u00e0i 48 (trang 82 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n
Gi\u1ea3i b\u00e0i t\u1eadp s\u00e1ch gi\u00e1o khoa<\/p>\n\n\n\n
B\u00e0i 49 (trang 82 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n
Gi\u1ea3i b\u00e0i t\u1eadp s\u00e1ch gi\u00e1o khoa<\/p>\n\n\n\n
M\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec3 h\u1ecdc t\u1eadp<\/a> hi\u1ec7u qu\u1ea3<\/p>\n\n\n\n \u0110\u1ed1i v\u1edbi b\u00e0i t\u1eadp v\u1ec1 ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean n\u00f3i ri\u00eang v\u00e0 c\u00e1c b\u00e0i t\u1eadp to\u00e1n l\u1edbp 6 n\u00f3i chung. V\u1ea5n \u0111\u1ec1 th\u01b0\u1eddng g\u1eb7p nh\u1ea5t v\u00e0 s\u1ef1 nh\u1ea7m l\u1eabn trong quy tr\u00ecnh gi\u1ea3i b\u00e0i t\u1eadp. \u0110\u1ec3 kh\u1eafc ph\u1ee5c nh\u1eefng sai l\u1ea7m trong qu\u00e1 tr\u00ecnh h\u1ecdc. H\u1ecdc sinh<\/a> c\u1ea7n coi tr\u1ecdng vi\u1ec7c ghi nh\u1edb ki\u1ebfn th\u1ee9c.<\/p>\n\n\n\n B\u1eaft \u0111\u1ea7u t\u1eeb vi\u1ec7c nh\u1edb c\u00e1c nguy\u00ean t\u1eafc \u0111\u1ecbnh l\u00fd, \u0111\u1ecbnh ngh\u0129a,\u2026 \u0111\u1ebfn c\u00e1c b\u01b0\u1edbc gi\u1ea3i v\u00e0 ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1. \u0110\u1ec3 c\u00f3 th\u1ec3 l\u00e0m t\u1ed1t nhi\u1ec7m v\u1ee5 ghi nh\u1edb, toppy t\u1ed5ng h\u1ee3p v\u00e0 gi\u1edbi thi\u1ec7u cho c\u00e1c em h\u1ecdc sinh<\/a> 4 b\u01b0\u1edbc \u0111\u1ec3 ghi nh\u1edb. N\u1ebfu \u00e1p d\u1ee5ng t\u1ed1t, c\u00e1c em c\u00f3 th\u1ec3 h\u1ecdc t\u1eadp<\/a> hi\u1ec7u qu\u1ea3. H\u1ea1n ch\u1ebf sai l\u1ea7m v\u00e0 c\u00f3 m\u1ed9t n\u1ec1n t\u1ea3ng ki\u1ebfn th\u1ee9c v\u1eefng ch\u1eafc.<\/p>\n\n\n\n T\u1ed5ng h\u1ee3p ki\u1ebfn th\u1ee9c l\u00fd thuy\u1ebft. Tr\u00ecnh b\u00e0y l\u1ea1i theo d\u1ea1ng s\u01a1 \u0111\u1ed3, d\u00e0n \u00fd<\/p>\n\n\n\n \u0110\u1ea7u ti\u00ean, mu\u1ed1n ghi nh\u1edb \u0111\u01b0\u1ee3c m\u1ed9t v\u1ea5n \u0111\u1ec1 \u0111\u1ec3 c\u00f3 th\u1ec3 v\u1eadn d\u1ee5ng trong th\u1ef1c t\u1ebf. Ta c\u1ea7n ph\u1ea3i hi\u1ec3u r\u00f5 b\u1ea3n ch\u1ea5t c\u1ee7a l\u00fd thuy\u1ebft. H\u1ecdc sinh<\/a> n\u00ean \u0111\u1ecdc l\u1ea1i l\u00fd thuy\u1ebft v\u00e0 ti\u1ebfn h\u00e0nh t\u1ed5ng h\u1ee3p.<\/p>\n\n\n\n \u0110\u1ecdc l\u1ea1i b\u00e0i h\u1ecdc t\u1eeb 2 \u0111\u1ebfn 3 l\u1ea7n, v\u00e0 t\u00f3m t\u1eaft th\u00e0nh c\u00e1c \u0111\u1ea7u m\u1ee5c l\u1edbn, nh\u1ecf,.. s\u1eafp x\u1ebfp theo th\u1ee9 t\u1ef1 gi\u1ea3m d\u1ea7n. Sau \u0111\u00f3 tr\u00ecnh b\u00e0y l\u1ea1i ki\u1ebfn th\u1ee9c \u0111\u00e3 t\u00f3m t\u1eaft d\u01b0\u1edbi d\u1ea1ng b\u1ea3ng bi\u1ec3u, s\u01a1 \u0111\u1ed3.<\/p>\n\n\n\n T\u1ed5ng h\u1ee3p ki\u1ebfn th\u1ee9c l\u00fd thuy\u1ebft. Tr\u00ecnh b\u00e0y l\u1ea1i theo d\u1ea1ng s\u01a1 \u0111\u1ed3, d\u00e0n \u00fd<\/p>\n\n\n\n V\u00ec sao n\u00ean tr\u00ecnh b\u00e0y l\u1ea1i l\u00fd thuy\u1ebft d\u01b0\u1edbi d\u1ea1ng s\u01a1 \u0111\u1ed3? Theo nh\u01b0 nghi\u00ean c\u1ee9u c\u1ee7a c\u00e1c nh\u00e0 khoa h\u1ecdc, s\u01a1 \u0111\u1ed3 t\u01b0 duy l\u00e0 m\u1ed9t h\u00ecnh th\u1ee9c ghi ch\u00e9p. C\u00f3 kh\u1ea3 n\u0103ng k\u00edch th\u00edch t\u1ed1i \u0111a s\u1ef1 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a n\u00e3o b\u1ed9. Kh\u00e1c ho\u00e0n to\u00e0n v\u1edbi nh\u1eefng th\u00f4ng tin \u0111\u01b0\u1ee3c ghi b\u1eb1ng h\u1ec7 th\u1ed1ng ng\u00f4n ng\u1eef, k\u00fd t\u1ef1, \u0111\u01b0\u1eddng th\u1eb3ng, \u2026 N\u1ebfu s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 t\u01b0 duy, bu\u1ed9c ph\u1ea3i k\u1ebft h\u1ee3p v\u1eadn d\u1ee5ng c\u00e1c th\u00f4ng tin s\u00e1ng t\u1ea1o h\u01a1n. Nh\u01b0 m\u00e0u s\u1eafc, s\u1ef1 s\u00e1ng t\u1ea1o, s\u1eed d\u1ee5ng kh\u00f4ng gian,\u2026 Nh\u01b0 v\u1eady, n\u00e3o s\u1ebd ph\u1ea3i s\u1eed d\u1ee5ng nh\u1eefng k\u1ef9 n\u0103ng<\/a> t\u1eeb c\u1ea3 n\u00e3o ph\u1ea3i v\u00e0 n\u00e3o tr\u00e1i. Nh\u01b0 v\u1eady, kh\u1ea3 n\u0103ng ghi nh\u1eadn th\u00f4ng tin \u0111\u01b0\u1ee3c n\u00e2ng l\u00ean t\u1ed1i \u0111a nh\u1ea5t.<\/p>\n\n\n\n Ghi ch\u00e9p<\/p>\n\n\n\n B\u00ean c\u1ea1nh vi\u1ec7c ghi nh\u1edb b\u1eb1ng c\u00e1ch t\u1ed5ng h\u1ee3p sau \u0111\u00f3 ch\u1ec9 nh\u00ecn v\u00e0 \u0111\u1ecdc. Ta n\u00ean k\u1ebft h\u1ee3p v\u1edbi ng\u00f4n ng\u1eef b\u1eb1ng c\u00e1ch ghi ch\u00e9p. Vi\u1ec7c ghi l\u1ea1i nh\u1eefng g\u00ec h\u1ecdc sinh suy ngh\u0129 \u0111\u01b0\u1ee3c ra gi\u1ea5y s\u1ebd l\u00e0 \u0111i\u1ec1u ki\u1ec7n t\u1ed1t \u0111\u1ec3 c\u1ea3i thi\u1ec7n tr\u00ed n\u00e3o cho tr\u1ebb. S\u1eafp x\u1ebfp cho con m\u1ed9t t\u01b0 duy logic. C\u00f3 kh\u1ea3 n\u0103ng t\u00ecm ra l\u1ed7i sai c\u1ee7a ch\u00ednh m\u00ecnh v\u00e0 h\u01a1n h\u1ebft l\u00e0 trong khi ghi ch\u00e9p, h\u1ecdc sinh c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n l\u1ea1i ph\u1ea7n t\u1ed5ng h\u1ee3p tr\u01b0\u1edbc \u0111\u00f3. B\u1ecf \u0111i nh\u1eefng ph\u1ea7n kh\u00f4ng quan tr\u1ecdng trong ti\u1ebfn tr\u00ecnh h\u1ecdc t\u1eadp<\/a>.<\/p>\n\n\n\n Gi\u1eef th\u00f3i quen ghi ch\u00e9p b\u00e0i v\u1edf<\/p>\n\n\n\n \u00d4n luy\u1ec7n, c\u1ee7ng c\u1ed1 l\u1ea1i ki\u1ebfn th\u1ee9c<\/p>\n\n\n\n \u0110\u1ed1i v\u1edbi h\u1ecdc t\u1eadp, vi\u1ec7c \u00f4n luy\u1ec7n l\u1ea1i v\u00e0 c\u1ee7ng c\u1ed1 th\u00eam ki\u1ebfn th\u1ee9c l\u00e0 v\u00f4 c\u00f9ng c\u1ea7n thi\u1ebft. Nh\u1ea5t l\u00e0 \u0111\u1ed1i v\u1edbi h\u1ecdc sinh l\u1edbp 6 v\u00e0 d\u1ea1ng b\u00e0i t\u1eadp ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean. N\u00ean tr\u00e1nh nh\u1eefng t\u01b0 duy nh\u01b0 ch\u1ec9 h\u1ecdc thu\u1ed9c l\u00fd thuy\u1ebft. Hay ch\u1ec9 ch\u0103m ch\u0103m v\u00e0o nh\u1eefng \u0111i\u1ec1u b\u1ea3n th\u00e2n \u0111\u00e3 t\u1ed5ng h\u1ee3p tr\u01b0\u1edbc \u0111\u00e2y.<\/p>\n\n\n\n Vi\u1ec7c h\u1ecdc l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh d\u00e0i, b\u1edfi th\u1ebf, c\u1ea7n t\u0103ng c\u01b0\u1eddng \u00f4n luy\u1ec7n. C\u00f3 th\u1ec3 luy\u1ec7n b\u1eb1ng c\u00e1ch h\u1ecdc l\u1ea1i l\u00fd thuy\u1ebft hay l\u00e0m c\u00e1c b\u00e0i t\u1eadp th\u1ef1c h\u00e0nh. T\u1eeb \u0111\u00f3, c\u1ee7ng c\u1ed1 th\u00eam c\u00e1c ki\u1ebfn th\u1ee9c kh\u00e1c v\u1ec1 c\u00f9ng ch\u1ee7 \u0111\u1ec1 b\u1ea3n th\u00e2n \u0111ang h\u1ecdc.<\/p>\n\n\n\n \u00d4n luy\u1ec7n, c\u1ee7ng c\u1ed1 l\u1ea1i ki\u1ebfn th\u1ee9c<\/p>\n\n\n\n B\u00ed quy\u1ebft c\u0103n b\u1ea3n \u0111\u1ec3 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c to\u00e1n h\u1ecdc ngay trong ti\u1ebft h\u1ecdc \u1edf tr\u01b0\u1eddng<\/p>\n\n\n\n C\u00f3 l\u1ebd, b\u00ed quy\u1ebft n\u00e0y kh\u00f4ng c\u00f2n xa l\u1ea1 g\u00ec v\u1edbi c\u00e1c b\u1ea1n. Mu\u1ed1n n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c ngay t\u1ea1i tr\u01b0\u1eddng, \u0111i\u1ec1u c\u01a1 b\u1ea3n nh\u1ea5t c\u1ea7n l\u00e0m \u0111\u00f3 l\u00e0: chu\u1ea9n b\u1ecb b\u00e0i tr\u01b0\u1edbc \u1edf nh\u00e0.<\/p>\n\n\n\n Chu\u1ea9n b\u1ecb b\u00e0i tr\u01b0\u1edbc \u1edf nh\u00e0 n\u00ean b\u1eaft \u0111\u1ea7u t\u1eeb b\u01b0\u1edbc \u00f4n luy\u1ec7n l\u1ea1i b\u00e0i c\u0169. Tr\u01b0\u1edbc ti\u00ean, c\u00e1c con c\u1ea7n h\u1ecdc v\u00e0 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c l\u00fd thuy\u1ebft v\u1ec1 c\u00e1c c\u00f4ng th\u1ee9c, t\u00ednh ch\u1ea5t, \u0111\u1ecbnh ngh\u0129a, \u2026 Nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e0y th\u01b0\u1eddng b\u1ecb b\u1ecf qua v\u00ec theo ph\u1ea7n \u0111\u00f4ng quan ni\u1ec7m hi\u1ec7n t\u1ea1i, to\u00e1n kh\u00f4ng ph\u1ea3i l\u00e0 m\u00f4n h\u1ecdc thu\u1ed9c. Tuy nhi\u00ean, n\u1ebfu kh\u00f4ng n\u1eafm v\u1eefng l\u00fd thuy\u1ebft, ph\u1ea7n gi\u1ea3i b\u00e0i t\u1eadp s\u1ebd tr\u1edf n\u00ean kh\u00f3 kh\u0103n. Th\u1eadm ch\u00ed, kh\u00f4ng th\u1ec3 gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp c\u0103n b\u1ea3n.<\/p>\n\n\n\n B\u01b0\u1edbc th\u1ee9 2 c\u1ee7a chu\u1ea9n b\u1ecb b\u00e0i \u1edf nh\u00e0 l\u00e0 \u0111\u1ecdc b\u00e0i m\u1edbi. Chu\u1ea9n b\u1ecb tr\u01b0\u1edbc cho nh\u1eefng ti\u1ebft h\u1ecdc tr\u00ean l\u1edbp s\u1ebd gi\u00fap c\u00e1c con t\u1ef1 tin h\u01a1n. C\u00f3 th\u1ec3 n\u0103ng n\u1ed5 h\u01a1n trong vi\u1ec7c x\u00e2y d\u1ef1ng b\u00e0i m\u1edbi.<\/p>\n\n\n\n L\u1eddi k\u1ebft:<\/p>\n\n\n\n V\u1ec1 d\u1ea1ng b\u00e0i t\u1eadp ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean l\u1edbp 6, toppy \u0111\u00e3 t\u1ed5ng h\u1ee3p m\u1ed9t s\u1ed1 ki\u1ebfn th\u1ee9c l\u00fd thuy\u1ebft, b\u00e0i t\u1eadp. C\u0169ng nh\u01b0 nh\u1eefng l\u1eddi khuy\u00ean b\u1ed5 \u00edch d\u00e0nh cho c\u00e1c b\u1ea1n h\u1ecdc sinh v\u00e0 ph\u1ee5 huynh. Vietlearn mong r\u1eb1ng nh\u1eefng chia s\u1ebb c\u1ee7a m\u00ecnh c\u00f3 th\u1ec3 mang t\u1edbi nh\u1eefng gi\u00e1 tr\u1ecb trong qu\u00e1 tr\u00ecnh h\u1ecdc t\u1eadp c\u1ee7a c\u00e1c con. Ch\u00fac c\u00e1c con h\u1ecdc t\u1ed1t!<\/p>\n\n\n\n <\/p>\n\n\n\n Th\u1ee9 t\u1ef1 th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p t\u00ednh: Gi\u1ea3i b\u00e0i & luy\u1ec7n t\u1eadp To<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":" Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean l\u00e0 m\u1ed9t trong nh\u1eefng b\u00e0i to\u00e1n c\u01a1 b\u1ea3n. Nh\u01b0ng d\u1ec5 g\u00e2y nh\u1ea7m l\u1eabn. V\u00ec v\u1eady, c\u1ea7n v\u00f4 c\u00f9ng c\u1ea9n th\u1eadn trong vi\u1ec7c h\u1ecdc ki\u1ebfn th\u1ee9c l\u00fd thuy\u1ebft. C\u0169ng nh\u01b0 ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp. Ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean l\u00e0 d\u1ea1ng b\u00e0i t\u1eadp […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[9,4],"tags":[],"class_list":["post-2721","post","type-post","status-publish","format-standard","hentry","category-toan-hoc","category-trung-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/2721","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=2721"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/2721\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=2721"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=2721"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=2721"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}