题目内容
(1)(
×12+6)÷
(2)(
+
)÷(1-
).
| 3 |
| 4 |
| 1 |
| 3 |
(2)(
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 5 |
分析:(1)先算乘法,再算加法,最后算除法;
(2)先算加法和减法,再算除法.
(2)先算加法和减法,再算除法.
解答:解:(1)(
×12+6)÷
=(9+6)÷
=15×3
=45;
(2)(
+
)÷(1-
)
=
×
=
.
| 3 |
| 4 |
| 1 |
| 3 |
=(9+6)÷
| 1 |
| 3 |
=15×3
=45;
(2)(
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 5 |
=
| 5 |
| 6 |
| 5 |
| 4 |
=
| 25 |
| 24 |
点评:分数混合运算的关键是抓住运算顺序,正确按运算顺序计算即可.
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