题目内容
细心算一算,一定算对哟!(1)(1-1
1 |
2 |
3 |
8 |
7 |
12 |
(2)-25÷(-4)×(
1 |
2 |
分析:(1)依据乘法分配律解题;
(2)先算乘方,再算乘除,最后计算加减.
(2)先算乘方,再算乘除,最后计算加减.
解答:(1)解:原式=1×(-24)-1
×(-24)-
×(-24)+
×(-24)
=-24+36+9-14
=-38+45
=7;
(2)解:原式=-32÷(-4)×
-12×(-15+16)3
=-32×(-
)×
-12×13
=2-12
=-10.
1 |
2 |
3 |
8 |
7 |
12 |
=-24+36+9-14
=-38+45
=7;
(2)解:原式=-32÷(-4)×
1 |
4 |
=-32×(-
1 |
4 |
1 |
4 |
=2-12
=-10.
点评:在进行有理数的乘法运算时,要灵活运用运算律;在进行有理数的混合运算时,注意运算的顺序.
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