题目内容
(2012?武胜县)用简便方法计算.
8.8-
-(0.8+
)
99×(
-
)+
×99.
8.8-
| 7 |
| 9 |
| 7 |
| 9 |
99×(
| 9 |
| 11 |
| 3 |
| 8 |
| 3 |
| 8 |
分析:(1)运用减法的性质以及加法交换律简算;
(2)运用乘法分配律简算.
(2)运用乘法分配律简算.
解答:解:(1)8.8-
-(0.8+
),
=8.8-
-0.8-
,
=8.8-0.8-(
+
),
=8-1
,
=6
;
(2)99×(
-
)+
×99,
=99×
-99×
+
×99,
=81.
| 7 |
| 9 |
| 7 |
| 9 |
=8.8-
| 7 |
| 9 |
| 7 |
| 9 |
=8.8-0.8-(
| 7 |
| 9 |
| 7 |
| 9 |
=8-1
| 5 |
| 9 |
=6
| 4 |
| 9 |
(2)99×(
| 9 |
| 11 |
| 3 |
| 8 |
| 3 |
| 8 |
=99×
| 9 |
| 11 |
| 3 |
| 8 |
| 3 |
| 8 |
=81.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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