已知13X^2-6XY+Y^2-4x+1=0,求(x+y)^9乘以x^10的值.

已知13X^2-6XY+Y^2-4X+1=0,求(XY-X^2)^5的值. 已知13x^2-6xy+y^2-4x+1=0,求(xy-x^2)^3的值. 已知x-y=6,xy=-1,求(2x+3x-2xy)-(x+4y+xy)-(3yx-2x+2y)的值 已知2/x-1/y=3,则(2y-x+4xy)/(3x-6y-5xy)=? 已知1/x-1/y=2,求3x+7xy-3y/2x-3xy-2y答案是1/x-1/y=2(y-x)/xy=2 得：x-y=-2xy(3x+7xy-3y)/(2x-3xy-2y)=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy)=xy/(-7xy)=-1/7 谁能帮我解释一下=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy) 是怎 已知13X^2-6XY+Y^2-4x+1=0,求(x+y)^13乘以x^10 已知：13x^2-6xy+y^2-4x+1=0,求（x+y）^2013*x^2011 (1)已知x+y=6,xy=-3,x^2y+xy^2=(2)x*[2-(1/x)]+(x/x^2-2x)*(x^2-4) .已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 已知|X-3Y-1|+(X+Y)^=4XY,求X/Y的值另外还有道：已知X^2+Y^2+6X-4Y+13=0,①求X,Y的值②X^2-Y^2的值已知|X-3Y-1|+(X+Y)^2=4XY，求X/Y的值 已知x y=1,xy=-3,求2xy-4x 4(y-2(xy-x)) 已知x+y=6,xy=4,求x^2y+xy^2的值~ 已知xy+x-y+1=6,(1-x^2)(1-y^2)+4xy=48,求xy-x+y+1的值!一定要今天 已知xy+x-y+1=6,(1-x^2)(1-y^2)+4xy=48,求xy-x+y+1的值 已知xy+x-y+1=6,(1-x^2)*(1-y^2)+4xy=48,求xy-x+y+1的值 已知x-y=3,xy=1,求（-2x+2x+3y)-(3xy+2y-2x)-(x+4y+xy) 1.已知x+y=-4,xy=3,求5（2分之1xy+2y）+[6x-(2xy+y-3x)]的值2.已知（x+3）^2+|x-y+10|=0求代数式5x^2y-[2x^2y-(3xy-xy^2)-3x^2]-2xy^2-y^2的值 已知1/x - 1/y = 2,求3x+7xy-3y / 2x-3xy-2y的值1/x-1/y=2(y-x)/xy=2 得：x-y=-2xy(3x+7xy-3y)/(2x-3xy-2y)=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy)=xy/(-7xy)=-1/71/x-1/y=2到(y-x)/xy=2 是怎么变化的..