解方程 3x-60%x=288 1/2-1/3x=1/5 4/5x-0.48=1.2.

问题描述:

解方程

3x-60%x=288
1
2
-
1
3
x=
1
5
4
5
x-0.48=1.2.

(1)3x-60%x=288,
            2.4x=288,
       2.4x÷2.4=288÷2.4,
               x=120;
(2)

1
2
1
3
x=
1
5

 
1
2
1
3
x+
1
3
x=
1
5
+
1
3
x,
    
1
2
1
5
1
5
+
1
3
x-
1
5

       
3
10
1
3
x,
   
3
10
÷
1
3
1
3
x÷
1
3

           x=
9
10

(3)
4
5
x-0.48=1.2,
4
5
x-0.48+0.48=1.2+0.48,
         
4
5
x=1.68,
      
4
5
x÷
4
5
=1.68÷
4
5

            x=2.1.