题目内容
计算下面各题.
|
|
1-(
|
分析:(1)先算减法,再算加法;
(2)先算加法,再算减法;
(3)先算中括号里面的减法,再算括号外面的减法.
(2)先算加法,再算减法;
(3)先算中括号里面的减法,再算括号外面的减法.
解答:解:(1)
-
+
=
+
=
;
(2)
+
-
=
-
=
;
(3)1-(
-
)
=1-
=
.
8 |
9 |
1 |
6 |
2 |
3 |
=
13 |
18 |
2 |
3 |
=
25 |
18 |
(2)
1 |
4 |
5 |
6 |
3 |
4 |
=
13 |
12 |
3 |
4 |
=
1 |
3 |
(3)1-(
3 |
4 |
2 |
5 |
=1-
7 |
20 |
=
13 |
20 |
点评:考查了分数加减混合运算的顺序,然后再进一步计算.
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