Question

分解因式：x-2xy+xy的平方等于

Answer 1

x�0�5-3y+xy-3x=x(x+y)-3(x+y)=(x-3)(x+y)
x�0�5+2xy+y�0�5-4=(x+y)�0�5-4=(x+y+2)(x+y-2)
x�0�5-4y�0�5+x-2y=(x+2y)(x-2y)+x-2y=(x+2y+1)(x-2y)
第四题不和第一题一样的么

Answer 2

x-2xy+xy²=x(1-2y+y²)
=x(1-y)²