解方程 3/4x+1/2x=9/8 1/2x+25%=10.

问题描述:

解方程
3
4
x+
1
2
x=
9
8

1
2
x+25%=10.

(1)

3
4
x+
1
2
x=
9
8

      (
3
4
+
1
2
)x=
9
8

            
5
4
x=
9
8

        
5
4
4
5
=
9
8
×
4
5

               x=
9
10

(2)
1
2
x+25%=10,
     0.5x+0.25=10,
0.5x+0.25-0.25=10-0.25,
          0.5x=9.75,
     0.5x÷0.5=9.75÷0.5,
             x=19.5.