题目内容
(2011?游仙区)用自己喜欢的方法算
| (315+285)÷(315-255) | 5-(
| ||||||||
(
|
3.3×
|
分析:(1)、(2)按分数、整数四则混合运算顺序计算.
(3)、(4)乘法分配律进行计算即可,使计算会更加简便.
(3)、(4)乘法分配律进行计算即可,使计算会更加简便.
解答:解:(1)(315+285)÷(315-255),
=600÷60,
=10;
(2)5-(
÷
+
),
=5-(4+
),
=5-4-
,
=
;
(3)(
+
-
)×36,
=
×36+
×36-
×36,
=9+6-12,
=3;
(4)3.3×
+0.75×3.7+75%×3,
=(3.3+3.7+3)×0.75,
=10×0.75,
=7.5.
=600÷60,
=10;
(2)5-(
| 6 |
| 7 |
| 3 |
| 14 |
| 6 |
| 13 |
=5-(4+
| 6 |
| 13 |
=5-4-
| 6 |
| 13 |
=
| 7 |
| 13 |
(3)(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 3 |
=9+6-12,
=3;
(4)3.3×
| 3 |
| 4 |
=(3.3+3.7+3)×0.75,
=10×0.75,
=7.5.
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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