题目内容
(1)(+12)-(-18)+(-7)-(+15)
(2)-22×7-(-3)×6+5
(3)(-1)2012×[(-2)5-32-
÷(-
)]
(4)-5m2n+4mn2-2mn+6m2n+3mn.
(2)-22×7-(-3)×6+5
(3)(-1)2012×[(-2)5-32-
5 |
14 |
1 |
7 |
(4)-5m2n+4mn2-2mn+6m2n+3mn.
(1)原式=12+18-7-15=30-22=8;
(2)原式=-4×7+18+5=-28+18+5=-5;
(3)原式=1×(-32-9+
×7)=-38.5;
(4)原式=m2n+4mn2+mn.
(2)原式=-4×7+18+5=-28+18+5=-5;
(3)原式=1×(-32-9+
5 |
14 |
(4)原式=m2n+4mn2+mn.
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