问题 解答题 (1)计算:12-|-1|+(12)-3-4cos30°(2)化简.(x+1x-xx-1)÷1(x-1)2. 答案 (1)原式=23-1+8-23=7;(2)原式=x2-1-x2x(x-1)×(x-1)=1-xx.故答案为:7,1-xx.