(x+y)(x—y)y(xy+1)
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(x+y)(x—y)y(xy+1)(x+y)(x—y)y(xy+1)(x+y)(x—y)y(xy+1)(x+y)(x—y)y(xy+1)＝﹙x﹣y﹚﹙xy﹢y﹚＝﹙x﹚y﹢xy﹣xy﹣y
(x+y)(x—y)y(xy+1)
(x+y)(x—y)y(xy+1)
(x+y)(x—y)y(xy+1)
(x+y)(x—y)y(xy+1) ＝﹙x﹣y﹚﹙xy﹢y﹚ ＝﹙x﹚y﹢xy﹣xy﹣y
(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