题目内容
| 4 |
| 5 |
| 5 |
| 13 |
| 3 |
| 5 |
| 13 |
| 5 |
| 5 |
| 13 |
| 3 |
| 5 |
分析:直接运用乘法的分配律计算.
解答:解:原式=-
×
-
×
+
×1
…(2分)
=
×(-
-
+1
)
=
×
=
.
| 4 |
| 5 |
| 5 |
| 13 |
| 3 |
| 5 |
| 5 |
| 13 |
| 5 |
| 13 |
| 3 |
| 5 |
=
| 5 |
| 13 |
| 4 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
=
| 5 |
| 13 |
| 1 |
| 5 |
=
| 1 |
| 13 |
点评:本题考查的是有理数的运算能力.在解题过程中注意灵活运用运算律,使计算简便.
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