1-(X的平方)+2xy-y的平方
问题描述:
1-(X的平方)+2xy-y的平方
答
1-x^2+2xy-y^2
=1-(x-y)^2
=(1+x-y)(1-x+y)
1-(X的平方)+2xy-y的平方
1-x^2+2xy-y^2
=1-(x-y)^2
=(1+x-y)(1-x+y)