题目内容
| 简便计算 (1)35×(-
| (2)12×(0.25-
| ||||
| (3)28x0.36+280×0.064 | (4)13×0.25+5÷4. |
(1)35×(1-
),
=35×1-35×
,
=35-(34+1)×
,
=35-3-
,
=32-
,
=31
;
(2)12×(0.25-
),
=12×(
-
),
=12×
-12×
,
=3-2,
=1;
(3)28×0.36+280×0.064,
=280×0.036+280×0.064,
=280×(0.036+0.064),
=280×0.1,
=28;
(4)13×0.25+5÷4,
=13×
+5×
,
=(13+5)×
,
=18×
,
=4.5.
| 3 |
| 34 |
=35×1-35×
| 3 |
| 34 |
=35-(34+1)×
| 3 |
| 34 |
=35-3-
| 3 |
| 34 |
=32-
| 3 |
| 34 |
=31
| 31 |
| 34 |
(2)12×(0.25-
| 1 |
| 6 |
=12×(
| 1 |
| 4 |
| 1 |
| 6 |
=12×
| 1 |
| 4 |
| 1 |
| 6 |
=3-2,
=1;
(3)28×0.36+280×0.064,
=280×0.036+280×0.064,
=280×(0.036+0.064),
=280×0.1,
=28;
(4)13×0.25+5÷4,
=13×
| 1 |
| 4 |
| 1 |
| 4 |
=(13+5)×
| 1 |
| 4 |
=18×
| 1 |
| 4 |
=4.5.
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