问题 解答题 (1)计算:(y6x2)2÷(-y24x)2. (2)计算:x2-2x+1x2-1÷x-1x2+x. 答案 (1)原式=y236x4×16x2y4=49x2y2,(2)原式=(x-1)2(x+1)(x-1)×x(x+1)x-1=x.