题目内容

解方程:
5
6
+
5
8
)x=
7
20
(1-25%)x=36 6×9-
1
2
x=26.8
x+20%x=40.
①(
5
6
+
5
8
)x=
7
20

   (
20
24
+
15
24
)x=
7
20

            
35
24
x=
7
20

       
35
24
24
35
=
7
20
×
24
35

              x=0.24;

②(1-25%)x=36,
     
3
4
4
3
=36×
4
3

           x=48;

    ③6×9-
1
2
x=26.8,
       54-0.5x=26.8,
  54-0.5x+0.5x=26.8+0.5x,
26.8-26.8+0.5x=54-26.8,
          0.5x=23.2,
             x=46.4.
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