问题 解答题
用递等式计算.
(1)[15.5-(1.5×
5
7
+1
1
2
×
2
7
)]÷14%
(2)[1
1
10
+2
7
20
÷(3
1
12
-1.125
)]×
9
23
-
1
6
答案

(1)[15.5-(1.5×

5
7
+1
1
2
×
2
7
)]÷14%

=[

31
2
-(
3
2
×
5
7
+
3
2
×
2
7
)]÷
7
50

=[

31
2
-(
5
7
+
2
7
)×
3
2
50
7

=[

31
2
-
3
2
50
7

=14×

50
7

=100;

(2)[1

1
10
+2
7
20
÷(3
1
12
-1.125
)]×
9
23
-
1
6

=[

11
10
+
47
20
÷(
37
12
-
9
8
)]×
9
23
-
1
6

=[

11
10
+
47
20
×
24
47
9
23
-
1
6

=[

11
10
+
12
10
9
23
-
1
6

=

23
10
×
9
23
-
1
6

=

9
10
-
1
6

=

11
15

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