1.x^2+11xy+24y^2 2.x-1-1/4x^2(计算题,

1.（xy-1）^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+(xy-1)(xy+1) （x^2+xy/x-y)/（xy/x-y)计算 f(xy,x-y)=x^2-xy+y^2.求f(x,y) (-x-y)(x^2+xy+y^2) 化简x^-y^/x^-2xy+y^ 2*(x-y)²(y-x)(xy) 1.x^2+11xy+24y^2 2.x-1-1/4x^2(计算题, x^2-xy/xy-y^2约分 1.(x-y)(x^2+xy+y^2) 2.(3x+2y)(2x+3y) 已知xy-x-y=11,求(xy-1)^2+(x+y-2)(x+y-2xy)的值. 9道因式分解题1.(x+y)^3+2xy(1-x-y)-1 2.x^3+x^2-2004*2005x 3.(x^2-x-6)(x^2+3x-4)+24 4.x^6+15x^3y+50y^2 5.（x^2+4x+6）+(x^2+6x+6)+x^26.(x-3)(x+4)(x-5)(x+6)+807.x^3-7x+68.x^4+y^4+(x+y)^49.xy(xy+1)+(xy+3)-2(x+y+1/2)-(x+y-1)^2 .(x+y-2)(x+y-2xy)+(xy-1)^2 (x^2-xy)y÷y-x/xy怎么做? 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy 二元二次方程组xy+x+y=11 x^2y+xy^2=30xy+x+y=11 x^2y+xy^2=30 x-y=1,xy=2.求：(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 .已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 (x+y)/x /(x-(2xy-y^2)/x) 因式分解