当前位置: X题卡 > 所有题目 > 题目详情

(x-y+)(x+y-)=_____________.

查看本题答案

你可能感兴趣的试题

若XY->Z,则X->Z,Y->Z  若X->Y,Y->Z,则X->YZ  若X->Y,Z包含Y,则X->Z  若X->Y,Y->Z,则X->Z  
若XY->Z,则X->Z,Y->Z  若X->Y,Y->Z,则X->YZ  若X->Y,Z包含Y,则X->Z  若X->Y,Y->Z,则X->Z  
)x3-x=x(x2-1); (  )x2-2xy+y2=(x-y)2 (  )x2y-xy2=xy(x-y) (  )x2-y2=(x-y)(x+y)  
xy(2x-2y)2   2xy(x-y)2   4xy(x2-2xy+y2)   4xy(x-y)2   
∑(X-X)2  ∑(Y-Y)2  ∑XY-(∑X)( ∑Y)  ∑Y2-(∑Y)2  ∑(X-X)2  
2x2-xy-x=2x(x-y-1)   -xy2+2xy-3y=-y(xy-2x-3)   x(x-y)-y(x-y)=(x-y)2   x2-x-3=x(x-1)-3