问题 解答题
1÷(6-1.25×0.8)   
2
15
÷(
19
21
+
3
7
)×
1
2

7
8
-
7
16
)×(
5
9
+
1
3
答案

(1)1÷(6-1.25×0.8),

=1÷(6-1),

=1÷5,

=0.2;

(2)

2
15
÷(
19
21
+
3
7
)×
1
2

=

2
15
÷
4
3
×
1
2

=

2
15
×
3
4
×
1
2

=

1
20

(3)(

7
8
-
7
16
)×(
5
9
+
1
3
),

=

7
16
×
8
9

=

7
18

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