下列变形正确的是( )A.?x+yx?y=?x?yx+yB.?x+y?x?y=?x?yx+yC.?x+y?x?y=x+yx?yD.?x+y?x?y=x?y
下列变形正确的是()A.?x+yx?y=?x?yx+yB.?x+y?x?y=?x?yx+yC.?x+y?x?y=x+yx?yD.?x+y?x?y=x?yx+y...
下列变形正确的是( )A.?x+yx?y=?x?yx+yB.?x+y?x?y=?x?yx+yC.?x+y?x?y=x+yx?yD.?x+y?x?y=x?yx+y
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