题目内容
用你喜欢的方法计算
(1)
+
+
(2)
+
-
(3)
+
-
(4)
-(
+
)+
.
(1)
1 |
2 |
2 |
5 |
1 |
3 |
(2)
20 |
21 |
7 |
17 |
20 |
21 |
(3)
5 |
16 |
6 |
8 |
5 |
32 |
(4)
15 |
16 |
5 |
16 |
1 |
4 |
1 |
2 |
分析:(1)从左向右进行解答即可;
(2)先算减法,再算加法;
(3)先算减法,再算加法;
(4)去括号,从左向右进行解答即可.
(2)先算减法,再算加法;
(3)先算减法,再算加法;
(4)去括号,从左向右进行解答即可.
解答:解:(1)
+
+
=
+
=
(2)
+
-
=
-
+
=0+
=
(3)
+
-
=
-
+
=
+
=
(4)
-(
+
)+
=
-
-
+
=
-
+
=
+
=
1 |
2 |
2 |
5 |
1 |
3 |
=
9 |
10 |
1 |
3 |
=
37 |
30 |
(2)
20 |
21 |
7 |
17 |
20 |
21 |
=
20 |
21 |
20 |
21 |
7 |
17 |
=0+
7 |
17 |
=
7 |
17 |
(3)
5 |
16 |
6 |
8 |
5 |
32 |
=
5 |
16 |
5 |
32 |
6 |
8 |
=
5 |
32 |
6 |
8 |
=
29 |
32 |
(4)
15 |
16 |
5 |
16 |
1 |
4 |
1 |
2 |
=
15 |
16 |
5 |
16 |
1 |
4 |
1 |
2 |
=
5 |
8 |
1 |
4 |
1 |
2 |
=
3 |
8 |
1 |
2 |
=
7 |
8 |
点评:此题主要考查学生运用四则运算计算方法.
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