x-0.25x=0.

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x-0.25x=0.x-0.25x=0.x-0.25x=0.x-0.25x=0.3750.75x=0.375x=0.50.75X=0.375X=0.5x-0.25x=0.375(1-0.25)x=0.

x-0.25x=0.
x-0.25x=0.

x-0.25x=0.
x-0.25x=0.375
0.75x=0.375
x=0.5

0.75X=0.375
X=0.5

x-0.25x=0.375
(1-0.25)x=0.375
0.75x=0.375
x=0.375/0.75
x=375/750
x=1/2=0.5

x=0.5过程楼上那位解释了

0.75X=0.375
X=0.5

x(1-0.25)=0.375
0.75x=0.375
x=0.5