题目内容
用你喜欢的方法计算.
15
| 25×32×125 | ||||||||||
[4-(
| 8÷
| ||||||||||
| 709×99+709 | 2.5×
|
(1)15
-4.25-5
,
=15
-(4.25+5
),
=15
-10,
=5
;
(2)25×32×125,
=25×4×8×125,
=(25×4)×(8×125),
=100×1000,
=100000;
(3)[4-(
-
)]×
,
=[4-
]×
,
=
×
,
=
;
(4)8÷
+5.2×
,
=8×
+5.2×
,
=3+1.95,
=4.95;
(5)709×99+709,
=709×(99+1),
=709×100,
=70900;
(6)2.5×
×0.4×2
,
=(2.5×0.4)×(
×2
),
=1×1,
=1.
| 3 |
| 14 |
| 3 |
| 4 |
=15
| 3 |
| 14 |
| 3 |
| 4 |
=15
| 3 |
| 14 |
=5
| 3 |
| 14 |
(2)25×32×125,
=25×4×8×125,
=(25×4)×(8×125),
=100×1000,
=100000;
(3)[4-(
| 3 |
| 4 |
| 3 |
| 8 |
| 4 |
| 29 |
=[4-
| 3 |
| 8 |
| 4 |
| 29 |
=
| 29 |
| 8 |
| 4 |
| 29 |
=
| 1 |
| 2 |
(4)8÷
| 8 |
| 3 |
| 3 |
| 8 |
=8×
| 3 |
| 8 |
| 3 |
| 8 |
=3+1.95,
=4.95;
(5)709×99+709,
=709×(99+1),
=709×100,
=70900;
(6)2.5×
| 3 |
| 7 |
| 1 |
| 3 |
=(2.5×0.4)×(
| 3 |
| 7 |
| 1 |
| 3 |
=1×1,
=1.
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