题目内容
[2
+(3
-1.75)÷1.56]÷
.
| 3 |
| 14 |
| 1 |
| 7 |
| 1 |
| 28 |
分析:根据分数的四则混合运算顺序计算,先算乘除,后算加减,有括号的先算括号里面的,计算过程中运用到了小数化成分数,并适时的运用了乘法的分配律.
解答:解:[2
+(3
-1.75)÷1.56]÷
,
=[2
+(3
-1
)÷1.56]÷
,
=(
+
÷
)÷
,
=(
+
×
)×28,
=(
+
)×28,
=
×28+
×28,
=62+25,
=87,
| 3 |
| 14 |
| 1 |
| 7 |
| 1 |
| 28 |
=[2
| 3 |
| 14 |
| 1 |
| 7 |
| 3 |
| 4 |
| 1 |
| 28 |
=(
| 31 |
| 14 |
| 39 |
| 28 |
| 39 |
| 25 |
| 1 |
| 28 |
=(
| 31 |
| 14 |
| 39 |
| 28 |
| 25 |
| 39 |
=(
| 31 |
| 14 |
| 25 |
| 28 |
=
| 31 |
| 14 |
| 25 |
| 28 |
=62+25,
=87,
点评:此题考查了分数的四则混合运算,计算过程中运用到了小数化成分数,并适时的运用了乘法的分配律.
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