问题
解答题
计算化简: (1)(+12)-(-18)+(-7)-(+15); (2)(-3)×(-9)-8×(-5); (3)-22×(-
(4)1+(-2)+|-2-3|-5 (5)100÷(-2)2-(-2)÷(-
(6)(-
(7)a2-[-4ab+(ab-a2)]-2ab |
答案
(1)原式=12+18-7-15=8
(2)原式=27+40=67
(3)原式=-4×(-
)+8÷4=41 2
(4)原式=1-2+5-5=-1
(5)原式=100÷4-3-8=14
(6)原式=-
-1 8
=-5 8 3 4
(7)原式=a2+4ab-ab+a2-2ab=2a2+ab.