脱式计算,能简算的简算. 4.2-1.38+5.8-3.62      

问题描述:

脱式计算,能简算的简算.
4.2-1.38+5.8-3.62      
1
6
÷[1÷(
3
5
-
3
10
)]
1个回答 分类:数学 2014-11-12

问题解答:

我来补答
(1)4.2-1.38+5.8-3.62 
=(4.2+5.8)-(1.38+3.62),
=10-5,
=5;
(2)
1
6÷[1÷(
3
5-
3
10)]
=
1
6÷[1÷
3
10],
=
1

10
3,
=
1
20;
(3)2÷
2
3-
2
3÷2  
=3-
1
3,
=2
2
3.
(4)
3
5×99+
3
5
=(99+1)×
3
5,
=100×
3
5,
=60.
 
 
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