题目内容
38-[23.5÷2
-(6.3-5
)+7.5×0.375]×
=
| 2 |
| 3 |
| 37 |
| 40 |
| 8 |
| 45 |
36
36
.分析:此题中括号内的2
和0.375相等,把0.375化成分数比较方便.然后利用乘法分配律的逆运算进行简算,于是把原式化为:38-[
×(23.5-1+7.5)]×
.
| 2 |
| 3 |
| 3 |
| 8 |
| 8 |
| 45 |
解答:解:38-[23.5÷2
-(6.3-5
)+7.5×0.375]×
,
=38-[23.5×
-
+7.5×
]×
,
=38-[
×(23.5-1+7.5)]×
,
=38-[
×30]×
,
=38-
×
,
=38-2,
=36.
故答案为:36.
| 2 |
| 3 |
| 37 |
| 40 |
| 8 |
| 45 |
=38-[23.5×
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 8 |
| 8 |
| 45 |
=38-[
| 3 |
| 8 |
| 8 |
| 45 |
=38-[
| 3 |
| 8 |
| 8 |
| 45 |
=38-
| 90 |
| 8 |
| 8 |
| 45 |
=38-2,
=36.
故答案为:36.
点评:此题考查了学生对乘法分配律的运用,以及计算能力.
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