问题 解答题 (1)计算:8-2sin45°+(2-π)0-(13)-1;(2)化简:(x2x+1-1x+1)•x2x2-x. 答案 (1)原式=22-2×22+1-3=2-2;(2)原式=x2-1x+1•x2x2-x=(x+1)(x-1)x+1•x2x(x-1)=x.