问题 解答题
解方程.
6+
7
10
x
=10  
x+
3
5
x
=12  
25%+x=75  
5
8
=
5
4
答案

(1)6+

7
10
x=10,

      6+

7
10
x-6=10-6,

         

7
10
x=4,

    

7
10
10
7
=4×
10
7

            x=

40
7

(2)x+

3
5
x=12,

      

8
5
x=12,

   

8
5
5
8
=12×
5
8

         x=

15
2

(3)25%+x=75,

     0.25+x=75,

0.25+x-0.25=75-0.25,

          x=74.75;

(4)x÷

5
8
=
5
4

 x÷

5
8
×
5
8
=
5
4
×
5
8

        x=

25
32

选择题
单项选择题