题目内容
计算:
(1)(-
)×(-
)÷(-
)÷3
(2)(-
)×(10-
-
).
(1)(-
| 3 |
| 5 |
| 7 |
| 2 |
| 5 |
| 4 |
(2)(-
| 3 |
| 5 |
| 5 |
| 3 |
| 25 |
| 6 |
分析:(1)先将除法转化为乘法,再约分计算即可;
(2)根据乘法分配律简便计算.
(2)根据乘法分配律简便计算.
解答:解:(1)(-
)×(-
)÷(-
)÷3
=(-
)×(-
)×(-
)×
=-
;
(2)(-
)×(10-
-
)
=(-
)×10-(-
)×
-(-
)×
=-6+1+
=-
.
| 3 |
| 5 |
| 7 |
| 2 |
| 5 |
| 4 |
=(-
| 3 |
| 5 |
| 7 |
| 2 |
| 4 |
| 5 |
| 1 |
| 3 |
=-
| 14 |
| 25 |
(2)(-
| 3 |
| 5 |
| 5 |
| 3 |
| 25 |
| 6 |
=(-
| 3 |
| 5 |
| 3 |
| 5 |
| 5 |
| 3 |
| 3 |
| 5 |
| 25 |
| 6 |
=-6+1+
| 5 |
| 2 |
=-
| 5 |
| 2 |
点评:考查了有理数的除法和有理数的乘法,关键是灵活运用运算律简便计算.
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