已知,x-3y=3,(x-3)(y+1)=5,求(x的平方-3)(3y的平方-1)的值

已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y 已知x=2+根号3,y=2-根号3,计算代数式(x+y/x-y-x-y/x+y)乘以(1/x^2-1/y^2) 已知|3x-y|+|x+y|=0,求x-y除以x*y的值. 已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy) 已知x(x-1)-(x²+y)=3 求x(x-y)+(y-x)的值 已知X-Y=3,求X-Y的2次幂减3X+3Y+1 已知|2x-3y|+|3x-y-1|=0,求x,y的值. 已知x:y=3:1,且x+y=12,求x-y的值. 已知3x+4y-6x-1-y=0,那么x-y=_______. 已知x/3=y/4,求(1+x/y)/(1-x/y)的值! 已知3x-4y/2x+y=1/2 求x/y的值