题目内容
能简算的要简算
(
|
|
40%×
|
分析:(1)根据四则混合运算的运算顺序计算即可.
(2)(3)根据乘法分配律进行计算即可;
(2)(3)根据乘法分配律进行计算即可;
解答:解:(1)(
-
)×
÷
,
=(
-
)×
×
,
=
×
×
,
=
;
(2)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)40%×
+0.45×70%-45%×0.1,
=40%×0.45+0.45×70%-0.45×0.1,
=0.45×(40%+70%-0.1),
=0.45×(1.1-0.1),
=0.45.
| 2 |
| 3 |
| 1 |
| 2 |
| 3 |
| 5 |
| 9 |
| 10 |
=(
| 4 |
| 6 |
| 3 |
| 6 |
| 3 |
| 5 |
| 10 |
| 9 |
=
| 1 |
| 6 |
| 3 |
| 5 |
| 10 |
| 9 |
=
| 1 |
| 9 |
(2)
| 11 |
| 12 |
| 1 |
| 6 |
| 5 |
| 6 |
| 11 |
| 12 |
=
| 11 |
| 12 |
| 1 |
| 6 |
| 5 |
| 6 |
=
| 11 |
| 12 |
=
| 11 |
| 12 |
(3)40%×
| 9 |
| 20 |
=40%×0.45+0.45×70%-0.45×0.1,
=0.45×(40%+70%-0.1),
=0.45×(1.1-0.1),
=0.45.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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