解方程 18-150%x=750% 2/3x-1/5x=1/15 6×4-1/2x=64/5.

问题描述:

解方程
18-150%x=750%

2
3
x-
1
5
x=
1
15

6×4-
1
2
x=
64
5

(1)18-150%x=750%,
   18-150%x+150%x=750%+150%x,
          18-750%=750%+150%x-750%,
             10.5=150%x,
       10.5÷150%=150%x÷150%,
                x=7;
(2)

2
3
x-
1
5
x=
1
15

       
7
15
x=
1
15

   
7
15
x÷
7
15
=
1
15
÷
7
15

           x=
1
7

(3)6×4-
1
2
x=
64
5

   24-
1
2
x+
1
2
x=
64
5
+
1
2
x,
       24-
64
5
=
64
5
+
1
2
x
64
5

         11.2=
1
2
x,
      11.2÷
1
2
=
1
2
x÷
1
2

            x=22.4.