问题 解答题
解方程.
3
4
x=
1
3
1-25%x=0.5.
答案

(1)9÷

3
4
x=
1
3

3
4
3
4
x=
1
3
×
3
4
x,

9=

1
4
x,

9×4=

1
4
x×4,

x=36;

(2)1-25%x=0.5,

1-0.25x+0.25x=0.5+0.25x,

1-0.5=0.5+0.25x-0.5,

0.5÷0.25=0.25x÷0.25,

x=2.

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