问题 解答题
解方程或比例.
1
4
x+
1
2
x=
5
8

2x
0.6
=
0.9
3

③0.5x-4×0.25=1.25.
答案

(1)

1
4
x+
1
2
x=
5
8

3
4
x=
5
8

3
4
4
3
=
5
8
×
4
3

x=

5
6

(2)

2x
0.6
=
0.9
3

2×3x=0.6×0.9,

6x=0.54,

6x÷6=0.54÷6,

x=0.09;

(3)0.5x-4×0.25=1.25,

0.5x-1=1.25,

0.5x-1+1=1.25+1,

0.5x÷0.5=2.25÷0.5,

x=4.5.

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