下列运算正确的是( )A.2x+3y=5xyB.4x4y2-5xy2=-x2yC.3x-2?2x3=6x-6D.4x4y2÷(-2xy2)=-2x
下列运算正确的是()A.2x+3y=5xyB.4x4y2-5xy2=-x2yC.3x-2?2x3=6x-6D.4x4y2÷(-2xy2)=-2x3...
下列运算正确的是( )A.2x+3y=5xyB.4x4y2-5xy2=-x2yC.3x-2?2x3=6x-6D.4x4y2÷(-2xy2)=-2x3
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