题目内容
混合运算.
×(
-
)
12÷
×
+
÷
-
.
| 3 |
| 7 |
| 1 |
| 2 |
| 1 |
| 3 |
12÷
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 5 |
| 2 |
| 5 |
| 8 |
| 15 |
| 1 |
| 4 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算减法,再算乘法;
(2)按照从左到右的顺序计算;
(3)先算除法,再算加减.
(2)按照从左到右的顺序计算;
(3)先算除法,再算加减.
解答:
解:(1)
×(
-
)
=
×
=
;
(2)12÷
×
=12×
×
=
;
(3)
+
÷
-
=
+
×
-
=
+
-
=
.
| 3 |
| 7 |
| 1 |
| 2 |
| 1 |
| 3 |
=
| 3 |
| 7 |
| 1 |
| 6 |
=
| 1 |
| 14 |
(2)12÷
| 3 |
| 4 |
| 5 |
| 6 |
=12×
| 4 |
| 3 |
| 5 |
| 6 |
=
| 40 |
| 3 |
(3)
| 3 |
| 5 |
| 2 |
| 5 |
| 8 |
| 15 |
| 1 |
| 4 |
=
| 3 |
| 5 |
| 2 |
| 5 |
| 15 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 5 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 11 |
| 10 |
点评:混合运算的关键是抓住运算顺序,按照运算顺序计算即可.
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