题目内容
计算下列各题:(1)0-3+(-
| 4 |
| 5 |
| 1 |
| 4 |
(2)10÷[
| 1 |
| 2 |
| 1 |
| 3 |
(3)18+32÷(-2)3-(-4)2×5;
(4)-7×(-
| 22 |
| 7 |
| 22 |
| 7 |
| 22 |
| 7 |
分析:前三题,根据有理数混合运算的顺序,先算乘方再算乘除最后算加减,有括号的先算括号里面的;
第四题,运用乘法分配律的逆用,使运算更加简便.
第四题,运用乘法分配律的逆用,使运算更加简便.
解答:解:(1)0-3+(-
)-(-22)-5÷(-
)
=-3-
+4+20
=21-
=20
;
(2)10÷[
-(-1+1
)]×6
=10÷(
-
)×6
=10÷
×6
=10×6×6
=360;
(3)18+32÷(-2)3-(-4)2×5
=18+32÷(-8)-16×5
=18-4-80
=18-84
=-66;
(4)-7×(-
)+19×(-
)-5×(-
)
=(-7+19-5)×(-
)
=(-12+19)×(-
)
=7×(-
)
=-22.
| 4 |
| 5 |
| 1 |
| 4 |
=-3-
| 4 |
| 5 |
=21-
| 4 |
| 5 |
=20
| 1 |
| 5 |
(2)10÷[
| 1 |
| 2 |
| 1 |
| 3 |
=10÷(
| 1 |
| 2 |
| 1 |
| 3 |
=10÷
| 1 |
| 6 |
=10×6×6
=360;
(3)18+32÷(-2)3-(-4)2×5
=18+32÷(-8)-16×5
=18-4-80
=18-84
=-66;
(4)-7×(-
| 22 |
| 7 |
| 22 |
| 7 |
| 22 |
| 7 |
=(-7+19-5)×(-
| 22 |
| 7 |
=(-12+19)×(-
| 22 |
| 7 |
=7×(-
| 22 |
| 7 |
=-22.
点评:本题信息量较大,主要考查有理数的混合运算和乘法分配律,熟练掌握混合运算的顺序是解题的关键,使用运算定律简便运算.
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