问题 解答题
脱式计算
5
7
-
5
8
)÷
5
56

1
6
×
3
8
)×24

2
3
÷(1-
4
9
答案

(1)(

5
7
-
5
8
)÷
5
56

=(

5
7
-
5
8
)×
56
5

=

5
7
×
56
5
-
5
8
×
56
5

=8-7,

=1;

(2)(

1
6
×
3
8
)×24,

=

1
6
×
3
8
×24,

=

3
2

(3)

2
3
÷(1-
4
9
),

=

2
3
÷
5
9

=

2
3
×
9
5

=

6
5

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