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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