(x+y)(x—y)y(xy+1)

(x+y)(x—y)y(xy+1) xy-1+x-y 证明:(y/x)+(x/y)+xy≥x+y+1 |x|/x+y/|y|+xy/|xy|= （x+y)*（x+1)-(xy+y*y)因式分解为多少 (x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1) .(x+y-2)(x+y-2xy)+(xy-1)^2 1/x-1/y=x,求5y+xy-5y/y-xy-x=? 因式分解xy-x-y+1 xy+x+y+1因式分解 1-x-y+xy 因式分解 因式分解:xy+x+y+1 xy-1+x-y因式分解 xy-x-y+1因式分解 钻机XY-1 ,X,Y, 化简xy-1-x+y [(y*y*y-y)/(xy+1)*(xy+1)-(x+y)*(x+y)]/[(x+y)*y/(x+1)]其中x=-11,y=1/12,化简再求值. xy(x-y)-x(x-y)²