题目内容

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
(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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