题目内容
用你喜欢的方法计算.
(1)
×18-7×
-
(2)42×
+
÷
(3)
÷(
-
)×
.
(1)
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
(2)42×
| 5 |
| 6 |
| 9 |
| 4 |
| 3 |
| 8 |
(3)
| 9 |
| 14 |
| 3 |
| 4 |
| 5 |
| 7 |
| 7 |
| 24 |
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则
分析:(1)利用乘法的分配律使运算简便;
(2)先算乘除法,再算加法;
(3)先算括号内的,再算除法、乘法.
(2)先算乘除法,再算加法;
(3)先算括号内的,再算除法、乘法.
解答:
解:(1)
×18-7×
-
=
×(18-7-1)
=
×10
=6;
(2)42×
+
÷
=42×
+
×
=35+6
=41;
(3)
÷(
-
)×
=
÷
×
=
×28×
=
.
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
=6;
(2)42×
| 5 |
| 6 |
| 9 |
| 4 |
| 3 |
| 8 |
=42×
| 5 |
| 6 |
| 9 |
| 4 |
| 8 |
| 3 |
=35+6
=41;
(3)
| 9 |
| 14 |
| 3 |
| 4 |
| 5 |
| 7 |
| 7 |
| 24 |
=
| 9 |
| 14 |
| 1 |
| 28 |
| 7 |
| 24 |
=
| 9 |
| 14 |
| 7 |
| 24 |
=
| 21 |
| 4 |
点评:本题考查了学生对分数四则混合运题目的掌握情况以及进行简算的能力.
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