a) ( 135 - 35 ) . ( -37 ) + 37 . ( - 42 - 58 )
b) -65 . ( 87 - 17 ) - 87 . ( 17 - 65 )
c) [ 3.(-2)-(-8)].(-7 -(-2).(-5)
d) 39.(-12)+(-39)+(117).29
e) 63.(-71-55) -71. (-55-63)
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a) Ta có: \(\left(-65\right)\cdot\left(87-17\right)-87\cdot\left(17-65\right)\)
\(=-65\cdot87+65\cdot17-87\cdot17+87\cdot65\)
\(=17\left(65-87\right)=17\cdot\left(-22\right)=-374\)
b) Ta có: \(\left(135-35\right)\cdot\left(-37\right)+37\cdot\left(-42-58\right)\)
\(=\left(-100\right)\cdot37+37\cdot\left(-100\right)\)
\(=37\left(-100-100\right)=37\cdot\left(-200\right)=-7400\)
a) (135 - 35) . (-37) + 37 . (-42 - 58)
= 100 . 0 . (-100)
= 0
b) -65 . (87 - 17) - 87 . (17 - 65)
= -65 . 70 - 87 . (-48)
= -4550 - 135
= -4415
a)135-35.(-37)+37.(-42-48)=-4490
b)-65.(87-17)-87.(17-65)=-374
Answer:
Bài 1:
\(\left(135-35\right).\left(-37\right)+37.\left(-42-58\right)\)
\(=100.\left(-37\right)+37.\left(-100\right)\)
\(=\left(-3700\right)+\left(-3700\right)\)
\(=-7400\)
\(-65.\left(87-17\right)-87.\left(17-65\right)\)
\(=\left(-65\right).87-\left(-65\right).17-87.17+87.65\)
\(=-\left(-65\right).17-87.17\)
\(=17.\left(65-87\right)\)
\(=-374\)
\([3.\left(-2\right)-\left(-8\right)].\left(-7\right)-\left(-2\right).\left(-5\right)\)
\(=[\left(-6\right)+8].\left(-7\right)-\left(-2\right).\left(-5\right)\)
\(=2.\left(-7\right)-10\)
\(=-24\)
Bài 2:
\(\left(-55\right).\left(-25\right).\left(-8\right)\)
\(=\left(-55\right).[\left(-25\right).\left(-8\right)]\)
\(=\left(-55\right).200\)
\(=-11000\)
\(\left(-1\right).\left(-2\right).\left(-3\right).\left(-4\right).\left(-5\right).10\)
\(=[\left(-1\right).10].[\left(-2\right).\left(-5\right)].[\left(-3\right).\left(-4\right)]\)
\(=\left(-10\right).10.12\)
\(=-1200\)
a; (135 - 35).(-37) + 37.(- 42 - 58)
= 100.(-37) + 37.(-100)
= - 100.(37+ 37)
= -100. 74
= - 7400
b; - 65.(87 - 17) - 87.(17 - 65)
= - 65.87 + 65.17 - 87.17 + 87.65
= (-65.87 + 87.65) - (87.17 - 65.17)
= 0 + 17.(87- 65)
= 17.(-22)
= - 374
c; [3.(-2) - (-8)]. (-7 - (-2).(-5))
= [-6 + 8].(-7 - 10)
= 2.(-17)
= - 34
d; 39.(-12) + (-39) + (117).29
= - 39.(12 + 1) + 3393
= -39.13 + 3393
= - 507 + 3393
= 2886
e; 63.(-71 - 55) - 71.(-55 - 63)
= -63.71 - 63.55 + 71.55 + 71.63
= (63.71 - 63.71) + (71.55 - 63.55)
= 0 + 55.(71 - 63)
= 55.8
= 440