x+80%y=42 y-x=12
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x+80%y=42 y-x=12
x+80%y=42 y-x=12
x+80%y=42 y-x=12
x+80%y=42
y-x=12
1.8y=54
y=30
x=18
唉,估计是没好好学习的人
x+80%y=42 (1)
y-x=12 (2)
(1)+(2)可得1.8y=54,y=30,x=18
因为 x+80%y=42
则 X=42-80%Y
因为 y-x=12
则 Y-(42-80%Y)=12
Y+80%Y=12+42
180%Y=54
Y=54/180%
Y=30
30-X=12
X=18
所以 Y=30 X=18
x+80%y=42 y-x=12
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