题目内容
| 脱式计算.(能简便的要简便) (1)2005-395+605 | (2)16×125×21 | (3)
| ||||||||||||
(4)
| (5)(
| (6)4.8×96+4.8÷
|
(1)2005-395+605,
=(2000+5)-(400-5)+(600+5),
=(2000-400+600)+5+5+5,
=2200+15,
=2215;
(2)16×125×21,
=2×8×125×21,
=2×21×(8×125),
=42×1000,
=42000;
(3)
÷(1-
),
=
÷
,
=
×
,
=
;
(4)
-8×
,
=
-
,
=
-
,
=
;
(5)(
-
)÷
,
=(
-
)÷
,
=
×
,
=
;
(6)4.8×96+4.8÷
,
=4.8×96+4.8×4,
=(96+4)×4.8,
=100×4.8,
=480.
=(2000+5)-(400-5)+(600+5),
=(2000-400+600)+5+5+5,
=2200+15,
=2215;
(2)16×125×21,
=2×8×125×21,
=2×21×(8×125),
=42×1000,
=42000;
(3)
| 1 |
| 4 |
| 1 |
| 3 |
=
| 1 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 4 |
| 3 |
| 2 |
=
| 3 |
| 8 |
(4)
| 4 |
| 5 |
| 3 |
| 32 |
=
| 4 |
| 5 |
| 3 |
| 4 |
=
| 16 |
| 20 |
| 15 |
| 20 |
=
| 1 |
| 20 |
(5)(
| 5 |
| 6 |
| 4 |
| 5 |
| 4 |
| 15 |
=(
| 25 |
| 30 |
| 24 |
| 30 |
| 4 |
| 15 |
=
| 1 |
| 30 |
| 15 |
| 4 |
=
| 1 |
| 8 |
(6)4.8×96+4.8÷
| 1 |
| 4 |
=4.8×96+4.8×4,
=(96+4)×4.8,
=100×4.8,
=480.
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