x=50(y+0.4) x=75(y-0.4) 解方程组,

x=50(y+0.4) x=75(y-0.4) 解方程组,
x=50(y+0.4) x=75(y-0.4) 解方程组,

x=50(y+0.4) x=75(y-0.4) 解方程组,
50(y+0.4) =75(y-0.4)
50y+20=75y-30
75y-50y=20+30
25y=50
y=2
x=50x(2+0.4)=120
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