化简算式:2a-(a+1)+(a的平方-2/a-1)
问题描述:
化简算式:2a-(a+1)+(a的平方-2/a-1)
答
原式=2a-a-1+(a²-2)/(a-1)
=(a-1)+(a²-2)/(a-1)
=[(a-1)²+(a²-2)]/(a-1)
=(a²-2a+1+a²-2)/(a-1)
=(2a²-2a-1)/(a-1)