问题 解答题
脱式计算.(能简便的要简便)
(1)2005-395+605
(2)16×125×21(3)
1
4
÷(1-
1
3
(4)
4
5
-8×
3
32
(5)(
5
6
-
4
5
)÷
4
15
(6)4.8×96+4.8÷
1
4
答案

(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
÷(1-
1
3
),

=

1
4
÷
2
3

=

1
4
×
3
2

=

3
8

(4)

4
5
-8×
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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