计算a-1/a-4 * a+2/a-2a+1 * a-4a+4/a+1

分类: 作业答案 • 2021-12-18 22:41:31

问题描述：

答

a-1/a-4 * a+2/a-2a+1 * a-4a+4/a+1 =(a+1)(a-1)/(a+2)(a-2)*(a+2)/(a-1)^2*(a-2)^2/(a+1) =(a-2)/(a-1)