题目内容
计算:
①-1
×(0.5-
)÷1
②18÷(
-
)×(-0.25)2÷
×
-
×(-32+62)×
.
①-1
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 9 |
②18÷(
| 7 |
| 9 |
| 5 |
| 6 |
| 9 |
| 4 |
| 4 |
| 9 |
| 4 |
| 9 |
| 1 |
| 6 |
分析:先算乘方,后算乘除,最后算加减,有括号的先算括号.
解答:解:①原式=-
×(-
)×
=
×
=
;
②原式=18×(-18)×
×
×
-
×27×
=-324×
×
×
-12×
=-4-2
=-6.
| 5 |
| 3 |
| 1 |
| 6 |
| 9 |
| 10 |
=
| 5 |
| 18 |
| 9 |
| 10 |
=
| 1 |
| 4 |
②原式=18×(-18)×
| 1 |
| 16 |
| 4 |
| 9 |
| 4 |
| 9 |
| 4 |
| 9 |
| 1 |
| 6 |
=-324×
| 1 |
| 16 |
| 4 |
| 9 |
| 4 |
| 9 |
| 1 |
| 6 |
=-4-2
=-6.
点评:本题考查了有理数的混合运算,解题的关键是熟悉有理数的混合运算的运算顺序.
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