题目内容

用递等式计算下面各题.
5
6
÷(5+
5
6

9
10
÷[
1
2
×(
5
6
-
3
10
)]
2
9
×0.375÷
6
7

(2-
4
5
×0.75)÷(2+
4
5
(1)
5
6
÷(5+
5
6
),
=
5
6
÷5
5
6

=
1
7


(2)
9
10
÷[
1
2
×(
5
6
-
3
10
)],
=
9
10
÷[
1
2
×
8
15
],
=
9
10
÷
4
15

=
27
8


(3)
2
9
×0.375÷
6
7

=
1
12
÷
6
7

=
7
72


(4)(2-
4
5
×0.75)÷(2+
4
5
),
=(2-0.6)÷2.8,
=1.4÷2.8,
=0.5.
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