题目内容
(0.5+
+3
÷1.25)÷(5
-1.25×1
).
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 4 |
| 3 |
| 5 |
分析:此题中既有分数,又有小数,通过观察,把小数化为分数计算比较简单,把小数化为分数以后,按运算顺序进行计算,先算括号内的乘法和除法,再算加法和减法.
解答:解:(0.5+
+3
÷1.25)÷(5
-1.25×1
),
=(
+
+
÷
)÷(5
-
×
),
=(
+
×
)÷(5
-2),
=(
+
)÷3
,
=
×
,
=1.
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 4 |
| 3 |
| 5 |
=(
| 1 |
| 2 |
| 1 |
| 4 |
| 25 |
| 8 |
| 5 |
| 4 |
| 1 |
| 4 |
| 5 |
| 4 |
| 8 |
| 5 |
=(
| 3 |
| 4 |
| 25 |
| 8 |
| 4 |
| 5 |
| 1 |
| 4 |
=(
| 3 |
| 4 |
| 10 |
| 4 |
| 1 |
| 4 |
=
| 13 |
| 4 |
| 4 |
| 13 |
=1.
点评:此题考查了四则混合运算的顺序,以及对数字灵活处理的能力.
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