问题 解答题
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
)]
2
3
-
2
3
÷2
3
5
×99+
3
5
答案

(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
6
÷
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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