先化简,再求值:x3-3x[x-2(x+2)],其中x=-2.
计算:
(1)(-3x)(-x2y)(-3xy2);
(2)(-ab)·(-a2c)2·6ab2;
(3)(-x2y)(2x-6xy2-1);
(4)-3a(2a-5)-2a(1-3a).
若规定一种运算 =ad-bc,则化简 =______.
若A,B为单项式,且5x(A-2y)=30x2y3+B,则A=______,B=______.
卫星脱离地球进入太阳系的速度为1.12×104m/s,计算3.6×103s卫星行走的路程是__________米.
计算:
(1)(-5a4)·(-8ab2)=_______;
(2)(-x2yz2)2·(3xy2)2=_______;
(3)a(2-a)-2(a+1)=________;
(4)(4x2-3x+6)·(-x)=_______;
(5)3x2y·(x3y2)·(5xy2)=________