题目内容
(
×2
+
)×1
.
| 7 |
| 16 |
| 2 |
| 3 |
| 1 |
| 7 |
| 10 |
| 11 |
分析:先算括号内的乘法,再算括号内的加法,最后算括号外的乘法.
解答:解:(
×2
+
)×1
,
=(
×
+
)×1
,
=(
+
)×1
,
=
×
,
=
.
| 7 |
| 16 |
| 2 |
| 3 |
| 1 |
| 7 |
| 10 |
| 11 |
=(
| 7 |
| 16 |
| 8 |
| 3 |
| 1 |
| 7 |
| 10 |
| 11 |
=(
| 7 |
| 6 |
| 1 |
| 7 |
| 10 |
| 11 |
=
| 55 |
| 42 |
| 21 |
| 11 |
=
| 5 |
| 2 |
点评:考查了分数的四则混合运算,注意运算顺序和运算法则,同时注意该约分的要约分.
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