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$A=(-135)\cdot29-13\cdot135+42\cdot(-65)$
$=(-135)\cdot29+13\cdot(-135)+42\cdot(-65)$
$=(-135)\cdot(29+13)+42\cdot(-65)$
$=(-135)\cdot42+42\cdot(-65)$
$=42\cdot(-135-65)$
$=42\cdot(-200)$
$=-8400$
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= ( - 29) . 135 + 13 . 135 +( - 2730)
= 135 . [ ( - 29) + 13] + ( - 2730) mik nghĩ là như này
= 135 . ( - 16) + ( - 2730)
= ( - 2160) + ( - 2730)
= - 4890
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a) \(42+37+135+58+63=\left(42+58\right)+\left(37+63\right)+135=100+100+135=335\)
b) \(25.17.8.4.125=\left(25.4\right).\left(8.125\right).17=100.1000.17=1700000\)
c) \(43.27+93.43+57.61+59.57=43.\left(27+93\right)+57.\left(61+57\right)=43.120+57.120\)
\(=120.\left(43+57\right)=120.100=12000\)
d) \(64.6+81.4+17.6=6.\left(64+17\right)+81.4=6.81+81.4=81.\left(6+4\right)=81.10=810\)
e) \(1+11+21+31+...+991=\left(991+1\right).\left[\left(991-1\right)\div10+1\right]\div2\)
\(=992.\left[990\div10+1\right]\div2=496.\left[99+1\right]=496.100=49600\)
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A = (-135). 29 - 13. 135 + 42. (-65)
A = 135. (-29) - 13. 135 + 42. (-65)
A = 135. [(-29) - 13] + 42. (-65)
A = 135. (-42) + 42. (-65)
A = 135. (-42) + (-42). 65
A = (-42). (135 + 65)
A = (-42). 200
A = -8400