将x^2-xy+3y-3x分解因式,下列分组方法不当的是A(x^2-3x)+(3y-xy)B.(x^2-xy)+(3y-3x)C.(x^2-xy)-(3x-3y)D.(x^2-xy-3x)+3y,

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将x^2-xy+3y-3x分解因式,下列分组方法不当的是A(x^2-3x)+(3y-xy)B.(x^2-xy)+(3y-3x)C.(x^2-xy)-(3x-3y)D.(x^2-xy-3x)+3y,

将x^2-xy+3y-3x分解因式,下列分组方法不当的是A(x^2-3x)+(3y-xy)B.(x^2-xy)+(3y-3x)C.(x^2-xy)-(3x-3y)D.(x^2-xy-3x)+3y,
将x^2-xy+3y-3x分解因式,下列分组方法不当的是
A(x^2-3x)+(3y-xy)
B.(x^2-xy)+(3y-3x)
C.(x^2-xy)-(3x-3y)
D.(x^2-xy-3x)+3y,

将x^2-xy+3y-3x分解因式,下列分组方法不当的是A(x^2-3x)+(3y-xy)B.(x^2-xy)+(3y-3x)C.(x^2-xy)-(3x-3y)D.(x^2-xy-3x)+3y,
A.(x^2-3x)+(3y-xy)=x(x-3) + y(3-x) =(x-3)(x-y)
B.(x^2-xy)+(3y-3x)=x(x-y) + 3(y-x) =(x-y)(x-3)
C.(x^2-xy)-(3x-3y)=x(x-y) - 3(x-y) =(x-y)(x-3)
D.(x^2-xy-3x)+3y
选D