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
(1)(6×1010)÷( )=-2×105; (2)( )·(-a2x2)=-5a;
(3)( )÷n=a-b+2c; (4)(3x3y2+x4y2-______)÷xy=_____+____-1.
计算:[(xn+1)4·x2]÷[(xn+2)3÷(x2)n].