问题 解答题
4
7
x-2
5
11
=0.25-
1
28
x.
答案

4
7
x-2
5
11
=0.25-
1
28
x,

4
7
x-2
5
11
+
1
28
x
=0.25-
1
28
x+
1
28
x

17
28
x-2
5
11
=0.25,

17
28
x-2
5
11
+2
5
11
=0.25+2
5
11

17
28
28
17
=2
31
44
×
28
17

x=4

5
11

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