题目内容
计算.
×60+
×
;
×
+
×
×
;
÷5+30÷
;
÷
-
×
÷
.
| 2 |
| 3 |
| 15 |
| 4 |
| 2 |
| 5 |
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 5 |
| 5 |
| 27 |
| 3 |
| 8 |
| 5 |
| 9 |
| 5 |
| 6 |
| 8 |
| 15 |
| 2 |
| 3 |
| 2 |
| 3 |
| 5 |
| 4 |
| 10 |
| 9 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)(2)先算乘法,再算加法.
(3)先算除法,再算加法.
(4)先算乘法与除法,再算减法.
(3)先算除法,再算加法.
(4)先算乘法与除法,再算减法.
解答:
解:(1)
×60+
×
=40+
=40
;
(2)
×
+
×
×
=
+
=
;
(3)
÷5+30÷
;
=
+36
=36
;
(4)
÷
-
×
÷
=
-
=
| 2 |
| 3 |
| 15 |
| 4 |
| 2 |
| 5 |
=40+
| 3 |
| 2 |
=40
| 3 |
| 2 |
(2)
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 5 |
| 5 |
| 27 |
| 3 |
| 8 |
=
| 9 |
| 64 |
| 1 |
| 24 |
=
| 35 |
| 192 |
(3)
| 5 |
| 9 |
| 5 |
| 6 |
=
| 1 |
| 9 |
=36
| 1 |
| 9 |
(4)
| 8 |
| 15 |
| 2 |
| 3 |
| 2 |
| 3 |
| 5 |
| 4 |
| 10 |
| 9 |
=
| 4 |
| 5 |
| 3 |
| 4 |
=
| 1 |
| 20 |
点评:完成本题要细心,注意运算顺序及通分、约分.
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