问题
选择题
分解因式:x2-2xy+y2+x-y的结果是( )
A.(x-y)(x-y+1)
B.(x-y)(x-y-1)
C.(x+y)(x-y+1)
D.(x+y)(x-y-1)
答案
x2-2xy+y2+x-y,
=(x2-2xy+y2)+(x-y),
=(x-y)2+(x-y),
=(x-y)(x-y+1).
故选A.
分解因式:x2-2xy+y2+x-y的结果是( )
A.(x-y)(x-y+1)
B.(x-y)(x-y-1)
C.(x+y)(x-y+1)
D.(x+y)(x-y-1)
x2-2xy+y2+x-y,
=(x2-2xy+y2)+(x-y),
=(x-y)2+(x-y),
=(x-y)(x-y+1).
故选A.