问题 解答题
X-
7
8
=
7
8

2
5
+X=
3
2

3X=4
X÷0.4=0.16.
答案

(1)X-

7
8
=
7
8

      X-

7
8
+
7
8
=
7
8
+
7
8

            X=

7
4

(2)

2
5
+X=
3
2

2
5
+X-
2
5
=
3
2
-
2
5

     X=

11
10

(3)3X=4,

3X÷3=4÷3,

    X=

4
3

(4)X÷0.4=0.16,

X÷0.4×0.4=0.16×0.4,

          X=0.064.

单项选择题
单项选择题