题目内容
计算下面各题,怎样简便就怎样算.
(1)(125+
| (2)
| (3)25×32×125 | ||||||||||||||
(4)99×
| (5)[
| (6)
|
(1)(125+
)×8,
=125×8+
×8,
=1000+1.75,
=1001.75;
(2)
×20%+
×
,
=
×(20%+
),
=
×1,
=
;
(3)25×32×125,
=25×(4×8)×125,
=(25×4)×(8×125),
=100×1000,
=100000;
(4)99×
,
=(100-1)×
,
=100×
-1×
,
=1-
,
=
;
(5)
×(122-21-1)÷
,
=
×100÷
,
=75÷
,
=7500;
(6)
÷
×
×
×270,
=
×
×
×
×270,
=125×5,
=625.
| 7 |
| 32 |
=125×8+
| 7 |
| 32 |
=1000+1.75,
=1001.75;
(2)
| 19 |
| 4 |
| 19 |
| 4 |
| 4 |
| 5 |
=
| 19 |
| 4 |
| 4 |
| 5 |
=
| 19 |
| 4 |
=
| 19 |
| 4 |
(3)25×32×125,
=25×(4×8)×125,
=(25×4)×(8×125),
=100×1000,
=100000;
(4)99×
| 1 |
| 100 |
=(100-1)×
| 1 |
| 100 |
=100×
| 1 |
| 100 |
| 1 |
| 100 |
=1-
| 1 |
| 100 |
=
| 99 |
| 100 |
(5)
| 3 |
| 4 |
| 1 |
| 100 |
=
| 3 |
| 4 |
| 1 |
| 100 |
=75÷
| 1 |
| 100 |
=7500;
(6)
| 1 |
| 27 |
| 4 |
| 5 |
| 125 |
| 2 |
| 4 |
| 5 |
=
| 1 |
| 27 |
| 5 |
| 4 |
| 125 |
| 2 |
| 4 |
| 5 |
=125×5,
=625.
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