√x(√x-√y)=3√y(5√y-√x)(√x)^2- √xy =15(√y)^2 -3√xy(√x)^2+2√xy -15(√y)^2 =0因式分解得：(√x+5√y)(√x- 3√y)=0所以：√x+5√y= 0 或√x- 3√y = 0(1)当√x+5√y= 0时,x=0,y=0(2x-√xy+3y)/(x+√xy-...