解答如下：x+2y=(yx)/44x+8y=xyxy-8y=4x(x-8)y=4x当x≠8时(x=8不成立)y=4x/(x-8) x+2y=(2x+1)/32y=(2x+1)/3-x2y=(1-x)/3y=(1-x)/6 4x/(x-8)=(1-x)/624x=(x-8)(1-x)24x=-x²+8x-8+xx²+15x+8=0应用求根公式,...