若-a2b÷mab=2a,则m=_______.
计算:(x6y2+x3y5-0.9x2y3)÷(-0.6xy).
计算:18a8b8÷(-6a6b5)·(-ab)2.
下列计算正确的是( )
A.6a2b3÷(3a2b-2ab2)=2b2-3ab B.12a3·(-6a2)÷(-3a)=-4a2+2a
C.(-xy2-3x)÷(-2x)=y2+ D.[(-4x2y)÷2xy2]÷2xy=-2x+y
计算:[2(3x2)2-48x3+6x]÷(-6x)等于( )
A.3x3-8x2 B.-3x3+8x2 C.-3x3+8x2-1 D.-3x3-8x2-1
如果(3x2y-2xy2)÷m=-3x+2y,则单项式m为( )
A.xy B.-xy C.x D.-y