解方程. (1)5/9x=5/6 (2)2/3x+50%x=42 (3)1-5/8x=3/8.

问题描述:

解方程.
(1)

5
9
x=
5
6
          
(2)
2
3
x+50%x=42     
(3)1-
5
8
x=
3
8

(1)

5
9
x=
5
6

     
5
9
9
5
=
5
6
×
9
5

          x=1.5
(2)
2
3
x+50%x=42    
     
4
6
x+
3
6
x=42
         
7
6
x=42
     
7
6
6
7
=42×
6
7

           x=36
(3)1-
5
8
x=
3
8

 1+
5
8
x-
5
8
x=
3
8
+
5
8
x
 
5
8
x+
3
8
-
3
8
=1-
3
8

   
5
8
8
5
=
5
8
×
8
5

         x=1