题目内容
计算下列各题
|
2-
| ||||||||||||||
2-
|
|
分析:(1)先算除法,再算加法;
(2)先算除法,再算减法;
(3)先从左到右的顺序计算乘法,再算减法;
(4)先同时运算乘法和除法,再算加法.
(2)先算除法,再算减法;
(3)先从左到右的顺序计算乘法,再算减法;
(4)先同时运算乘法和除法,再算加法.
解答:解:(1)
+3÷
=
+6
=6
;
(2)2-
×
=2-
=1
;
(3)2-
×
×
=2-
×
=2-
=1
;
(4)
×
+
÷
=
+
=
.
1 |
3 |
1 |
2 |
=
1 |
3 |
=6
1 |
3 |
(2)2-
8 |
15 |
9 |
16 |
=2-
3 |
10 |
=1
7 |
10 |
(3)2-
8 |
9 |
3 |
8 |
1 |
7 |
=2-
1 |
3 |
1 |
7 |
=2-
1 |
21 |
=1
20 |
21 |
(4)
4 |
5 |
2 |
3 |
1 |
5 |
3 |
4 |
=
8 |
15 |
4 |
15 |
=
4 |
5 |
点评:本题考查了简单的四则混合运算,计算时先理清楚运算顺序,根据运算顺序逐步求解即可.
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