5/x+3/y=1(x>0,y>0),则xy的最小值为15

（x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) （5x-6y)(x+y)=0(x不等于y),则y/x= {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/x-y=___. |x+y-3|+5(x-y-1)的平方=0则y的平方等于 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y= 若x,y满足|x-y+1|+(x+y+3)^2=0则x^2-y^2= 方程组x²-y²-3x+5y=0,x-y-1=0 |x-2y+1|+(x+y-5)²=0,则5x+4y= 若5X-8Y=0,则X+3Y/X-3Y= 已知5|x+y-3|+（x-y）²=0则x=,y= 3x-5y=0,则x-2y/x+3y的值是多少? 若|x+y-3|+(x-y-5)^2=0,则x)^2-y^2= 如果|x-2y+1|+|2x-y-5|=0,则x+y=?