x-5=y+2 (x-5)(y+2)=xy 怎么算
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x-5=y+2(x-5)(y+2)=xy怎么算x-5=y+2(x-5)(y+2)=xy怎么算x-5=y+2(x-5)(y+2)=xy怎么算(x-5)(y+2)=xy则xy+2x-5y-10=xy则2x
x-5=y+2 (x-5)(y+2)=xy 怎么算
x-5=y+2 (x-5)(y+2)=xy 怎么算
x-5=y+2 (x-5)(y+2)=xy 怎么算
(x-5)(y+2)=xy
则xy+2x-5y-10=xy
则2x-5y=10①
x-5=y+2
则x=y+7,代入①,得
2y+14-5y=10
解得y=4/3
则x=4/3+7=25/3
解，令x-5=y+2=t
则x=t+5 , y=t-2 代入(x-5)(y+2)=xy
t^2=(t+5)(t-2 ）即t=10/3
即x=t+5=25/3，
y=t-2=4/3
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