x=3/5y x-10=55%y
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x=3/5yx-10=55%yx=3/5yx-10=55%yx=3/5yx-10=55%y将x=3/5y代入x-10=55%y得：0.6y-10=0.55y0.05y=10y=200将y=200代入x
x=3/5y x-10=55%y
x=3/5y x-10=55%y
x=3/5y x-10=55%y
将x=3/5y代入 x-10=55%y得：
0.6y-10=0.55y
0.05y=10
y=200
将y=200代入x=3/5y得：x=120
55％=11/20,,所以x=3/5y x-10=11/20y
所以3/5y-10=11/20
所以12/20y-11/20y=10
y=200
x=120
x=3/5y x-10=55%y
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