计算:(1)-12+15-|-7-8|(2)(-3)×(-9)-(-5)(3)(-56+23-34)÷112(4)1÷(-3)×(-13)(5)(-3)2-(-112)3×29-6÷(-23)2(6)-22×{[423÷(-4)+(-0?4)]÷(-13)}(7)(x2+2xy+y2)-(x2-xy+y2)(8)9a-数学
题文
计算: (1)-12+15-|-7-8| (2)(-3)×(-9)-(-5) (3)(-
(4)1÷(-3)×(-
(5)(-3)2-(-1
(6)-22×{[4
(7)(x2+2xy+y2)-(x2-xy+y2) (8)9a2-[7a2-2a-2(a2-3a)]-3 |
答案
(1-)-12+15-|-7-8|=-12+15-15=-12 (2)(-3)×(-9)-(-5)=27+5=32 (3)(-
(4)1÷(-3)×(-
(5)(-3)2-(-1
|