问题
选择题
下列分解因式正确的是[ ]
A．2x2-xy-x=2x(x-y-1)
B．-xy2+2xy-3y=-y(xy-2x-3)
C．x(x-y)-y(x-y)=(x-y)2
D．x2-x-3=x(x-1)-3
答案
答案：C
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下列分解因式正确的是[ ]
A．2x2-xy-x=2x(x-y-1)
B．-xy2+2xy-3y=-y(xy-2x-3)
C．x(x-y)-y(x-y)=(x-y)2
D．x2-x-3=x(x-1)-3
答案：C