脱式计算.(能简便的要简便)(1)2005-395+605 (2)16×125×21 (3)14÷(1-13) (4)45-8×3
脱式计算.(能简便的要简便)(1)2005-395+605(2)16×125×21(3)14÷(1-13)(4)45-8×332(5)(56-45)÷415(6)4.8×...
脱式计算.(能简便的要简便)(1)2005-395+605 (2)16×125×21 (3)14÷(1-13) (4)45-8×332 (5)(56-45)÷415 (6)4.8×96+4.8÷14.
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(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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