题目内容
[50%÷0.625+(2
-1
)×
]÷4
.
| 1 |
| 3 |
| 1 |
| 5 |
| 3 |
| 7 |
| 1 |
| 6 |
分析:把百分数化为小数,先算除法和小括号内的,0.5÷0.625=0.8,再把0.8化为分数.再算中括号好内的,最后算括号外的.
解答:解:[50%÷0.625+(2
-1
)×
]÷4
,
=[0.5÷0.625+
×
]÷4
,
=[0.8+
×
]÷4
,
=[
+
]÷4
,
=
×
,
=
.
| 1 |
| 3 |
| 1 |
| 5 |
| 3 |
| 7 |
| 1 |
| 6 |
=[0.5÷0.625+
| 17 |
| 15 |
| 3 |
| 7 |
| 1 |
| 6 |
=[0.8+
| 17 |
| 15 |
| 3 |
| 7 |
| 1 |
| 6 |
=[
| 4 |
| 5 |
| 17 |
| 35 |
| 1 |
| 6 |
=
| 9 |
| 7 |
| 6 |
| 25 |
=
| 54 |
| 175 |
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则.
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