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(2008•北京)已知x-3y=0,求•(x-y)的值.
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(2008•北京)已知x-3y=0,求
•(x-y)的值.
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(2008•北京)已知x-3y=0,求•(x-y)的值.
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(2008•北京)已知x-3y=0,求•(x-y)的值.
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(2008•北京)已知x-3y=0,求•(x-y)的值.
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(2008•北京)已知x-3y=0,求•(x-y)的值.
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(2008•宁夏)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
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(2008•莆田)下列运算正确的是( )
A.x2+x3=x5
B.(x+y)2=x2+y2
C.(2xy2)3=6x3y6
D.-(x-y)=-x+y