解方程: 3 x - 1 - x + 3 x 2 - 1 = 0 .
计算:; 解方程(2)8(x-1)3+27=0.
计算:(1)(-) (2)| | + || +
(本题16分)计算:(1) (2) (3) -14×(-2)+(-5)×2+4× (4)
计算:(1) (2) (3) (4)
计算: