解方程:x(x-3)-2(3-x)=x2-8.
先化简,再求值:x(4x2-x+6)-2x(x2-1),其中x=-3.
计算:
(1)(-3x)3·(5x2y).
(2)·(-12y).
(3)(-4xy2)·.
(4)x3-2x .
若(x3+ax2-x2)·(-8x4)的运算结果中不含x的六次项,则a的值为___.
填空:
(1)(4x2-3x+6)·=___.
(2)a(2-a)-2(a+1)=___.
填空:
(1)(-5a4)·(-8ab2)=___.
(2)3x2y··(5xy2)=___.
(3)(2x-3y)=___.
(4)(-2ab)·(3a2-2ab-4b2)=___.