问题 解答题
解方程:
5
6
+
5
8
)x=
7
20
(1-25%)x=366×9-
1
2
x=26.8
x+20%x=40.
答案

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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