Bai 12 tính nhanh
A = 123 ( 123 + 154 ) + 77²
B = 324 -(274+1)(96-1)
C=852+752+652+55²-45²-35²-25²-15²
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B=\(3^{24}-\left(27^4+1\right)\left(9^6+1\right)=-1062883\)A=123(123+154)+772=123.277+772=34843
C=\(85^2+75^2+65^2+55^2-45^2-35^2-25^2-15^2=16000\)
a, 29+132+237+868+763
= 29+(132+868)+(237+763)
= 29+1000+1000 =2029
b, 652+327+148+15+73
= (652+148)+(327+73)+15
= 800+400+15 =1215
c, 347+418+123+12
= (347+123)+(418+12)
= 470+430 =900
A=123^2 + 54.123 + 77^2
= 123^2 + 2.123.77 + 77^2 - (154-54).123
= (123+77)^2 - 100.123
= 200^2 -12300
= 40000-12300
= 27700.
- Giải:
a) 29 + ( 132 + 868 ) + ( 237 + 763 )
= 29 + ( 1000 + 1000 )
= 29 + 2000 = 2029
b) 652 + 327 + 148 + 15 + 73
= ( 652 + 148 ) + ( 327 + 73 ) + 15
= ( 800 + 400 ) + 15 = 1215
-------Phần còn lại nhờ mấy bn khác lm hộ nhé-------
a) 29 + 132 + 237 + 868 + 763
= 29 + (132 + 868) + (237 + 763)
= 29 + 1000 + 1000
= 2029
b) 652 + 327 + 148 + 15 + 73
= (652 + 148) + (327 + 73) + 15
= 800 + 400 + 15
= 1215
c) 35 . 24 + 35 . 38 + 65 . 75 + 45 . 65
= 35(24 + 38) + 65(75 + 45)
= 35 . 62 + 65 . 120
= 5 . 7 . 2 . 31 + 65 . 12 . 10
= 10 . 7 . 31 + 65 . 12 .10
= 10(7 . 31 + 65 . 12)
= 10(217 + 780)
= 10 . 997
= 9970
d) 3 . 25 + 4 . 37 . 6 + 2 . 38 . 12
= 3 . 25 + 4 . 37 . 2 . 3 + 2 . 38 . 12
= 3 . 25 + 12 . 37 . 2 + 2 . 38 . 12
= 3 . 25 + 12 . 2(37 + 38)
= 3 . 25 + 12 . 2 . 75
= 3 . 25 + 12 . 2 . 3 . 25
= 3 . 25(1 + 12 . 2)
= 3 . 25 . 25
= 1875
nhân hết ra là xong nha
a) 85x35-85x27-35x85+35x27=27x(35-85)=-1350
mấy cái kia cũng tương tự v
_Kudo_
a, 42x(54+17):71
=42x71:71=42
b, 123x(154-65):89
=123x89:89=123
c,324x(6+4):324
=324x10:324=10x324:324=10
\(a)\left(42\times54+17\times42\right):71\)
\(=42\times54+17\times42:71\)
\(=42\times\left(54+17\right):71\)
\(=42\times71:71\)
\(=42\)
\(b)\left(123\times154-65\times123\right):89\)
\(=123\times154-65\times123:89\)
\(=123\times\left(154-65\right):89\)
\(=123\times89:89\)
\(=123\)
\(c)\left(324\times6+4\times324\right):\left(162\times2\right)\)
\(=324\times6+4\times324:324\)
\(=324\times\left(6+4\right):324\)
\(=324\times10:324\)
\(=3240:324\)
\(=10\)
B=2006 * 2008 -3 / 2005 + 2005 * 2008
B=(2005+1)* 2008 -3 / 2005 +2005 *2008
B=2005 * 2008 + 2008 -3 / 2005 +2005*2008
B=2005 * 2008 + 2005 / 2005 +2005 * 2008
B= 1
a) \(A=123\left(123+154\right)+77^2\)
\(A=123^2+\left(123.154\right)+77^2=\left(123+77\right)^2=200^2=400\)
b) \(B=3^{24}-\left(2^{47}+1\right)\left(9^6-1\right)\)
\(B=3^{24}-\left(3^{12}-1\right)\left(3^{12}+1\right)\)
\(B=3^{24}-3^{24}+1=1\)
c) \(C=85^2+75^2+65^2+55^2-45^2-35^2-25^2-15^2\)
\(C=\left(85^2-15^2\right)+\left(75^2-25^2\right)+\left(65^2-35^2\right)+\left(55^2-45^2\right)\)
\(C=\left(85+15\right)\left(85-15\right)+\left(75+25\right)\left(75-25\right)+\left(65+35\right)\left(65-35\right)\left(55+45\right)\left(55-45\right)\)
\(C=100\left(60+50+40+30+20+10\right)\)
\(C=100.210=21000\)
A=40000
B=1
C=16000