题目内容
(2012?武汉模拟)计算:(5
-0.8+2
)×(7.6÷
+2
×1.25)=
| 5 |
| 9 |
| 4 |
| 9 |
| 4 |
| 5 |
| 2 |
| 5 |
90
90
.分析:本题要据式中数据的特点,将式中的小数化为分数,然后再据结合律及分配律进行巧算.
解答:解:(5
-0.8+2
)×(7.6÷
+2
×1.25)
=[(5
+2
)-0.8]×(7
×
+2
×
),
=(8-0.8)×
×(7
+2
),
=7.2×
×10,
=72×
,
=90;
故答案为:90.
| 5 |
| 9 |
| 4 |
| 9 |
| 4 |
| 5 |
| 2 |
| 5 |
=[(5
| 5 |
| 9 |
| 4 |
| 9 |
| 3 |
| 5 |
| 5 |
| 4 |
| 2 |
| 5 |
| 5 |
| 4 |
=(8-0.8)×
| 5 |
| 4 |
| 3 |
| 5 |
| 2 |
| 5 |
=7.2×
| 5 |
| 4 |
=72×
| 5 |
| 4 |
=90;
故答案为:90.
点评:完成本题要认真分析式中数据,然后据运算定律进行巧算.
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