Question

数学因式分解2xy-x的平方-y的平方+1

Answer 1

=1-(x²-2xy+y²)
=1-(x-y)²
=(1-x+y)(1+x-y)

追问

x的平方+2xy+y的平方-1 这道题要怎么写

追答

x的平方+2xy+y的平方-1

=（x+y）²-1
=(x+y+1)(x+y-1);

x的平方+2xy+y的平方-1

=（x+y）²-1
=(x+y+1)(x+y-1);