题目内容
计算下面各题.
-
×
-
×
.
| 7 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 5 |
| 4 |
| 6 |
| 11 |
| 11 |
| 15 |
分析:通过观察,这两道题都是先算乘法,再算减法.
解答:解:(1)
-
×
,
=
-
,
=
;
(2)
-
×
,
=
-
,
=
.
| 7 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
=
| 7 |
| 3 |
| 1 |
| 20 |
=
| 137 |
| 60 |
(2)
| 5 |
| 4 |
| 6 |
| 11 |
| 11 |
| 15 |
=
| 5 |
| 4 |
| 2 |
| 5 |
=
| 17 |
| 20 |
点评:完成此题,注意运算顺序和运算法则,在做减法计算时,注意通分.
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