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$A=(-135)\cdot29-13\cdot135+42\cdot(-65)$
$=(-135)\cdot29+13\cdot(-135)+42\cdot(-65)$
$=(-135)\cdot(29+13)+42\cdot(-65)$
$=(-135)\cdot42+42\cdot(-65)$
$=42\cdot(-135-65)$
$=42\cdot(-200)$
$=-8400$
= ( - 29) . 135 + 13 . 135 +( - 2730)
= 135 . [ ( - 29) + 13] + ( - 2730) mik nghĩ là như này
= 135 . ( - 16) + ( - 2730)
= ( - 2160) + ( - 2730)
= - 4890
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) \(1+11+21+31+...+991=\left(991+1\right).\left[\left(991-1\right)\div10+1\right]\div2\)
\(=992.\left[990\div10+1\right]\div2=496.\left[99+1\right]=496.100=49600\)
a.17⋅(29−(−111)]+29⋅(−17)17⋅(29−(−111))+29⋅(−17)
=17⋅(29+111)−29⋅17=17⋅(29+111)−29⋅17
=17⋅(29+111−29)=17⋅(29+111−29)
=17⋅(29−29+111)=17⋅(29−29+111)
=17⋅111=17⋅111
=2997=2997
b.19⋅43+(−20)⋅43−(−40)19⋅43+(−20)⋅43−(−40)
=19⋅43−20⋅43+40=19⋅43−20⋅43+40
=43(19−20)+40=43(19−20)+40
=43⋅(−1)+40=43⋅(−1)+40
=−43+40=−43+40
=−3=−3
[ chúc bạn học tốt ]
Ta có :\(37.\left(29-23\right)-29.\left(37-23\right)=37.29-37.23-29.37+29.23\)
\(=23.29-37.23\)
\(=23.\left(29-37\right)\)
\(=23.\left(-8\right)\)
\(=-184\)
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