问题 解答题
x+
3
8
=
9
8
x-
3
7
=
1
2
x÷2.5=0.80.1x=30.
答案

①x+

3
8
=
9
8

   x+

3
8
-
3
8
=
9
8
-
3
8

        x=

3
4

②x-

3
7
=
1
2

x-

3
7
+
3
7
=
1
2
+
3
7

     x=

13
14

   ③x÷2.5=0.8,

x÷2.5×2.5=0.8×2.5,

          x=2;

   ④0.1x=30,

0.1x÷0.1=30÷0.1,

        x=300.

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