3、下列计算中,不正确的是( )
A.-2x+3x=x B.6xy2÷2xy=3y C.(-2x2y)3=-6x6y3 D.2xy2·(-x)=-2x2y2
A.-2x+3x=x B.6xy2÷2xy=3y
C.(-2x2y)3=-6x6y3 D.2xy2·(-x)=-2x2y2
C