X-75％=1/4 1-25％X=3/8
问题描述：
X-75％=1/4 1-25％X=3/8
答
X-75％=1/4
x-0.75=0.25
x=0.25+0.75
x=1
1-25％X=3/8
1-0.25x=0.375
0.25x=1-0.375
0.25x=0.625
x=0.625÷0.25
x=2.5