解方程和不等式组:
(1)xx-1+21-x=2;
(2)2x-6<0-3x⩽6.
计算:(-3a2b)•(ab2)3=
计算:(4×103)×(3×103)=
计算:(-2x2y)•(-3x2y3)=
计算:-2xy2•(-3xy)2=
化简:(2x2y2)•(-7xy2)=