灵鹊做题网帮我解决一道初中数学化简题
来源：学生作业帮 编辑：灵鹊做题网作业帮 分类：数学作业 时间：2024/05/15 17:04:42
帮我解决一道初中数学化简题
(a²-1/a²-5a+6)/(a²+a-2/a-3)-(a+3/a²-4)要过程
(a²-1/a²-5a+6)/(a²+a-2/a-3)-(a+3/a²-4)要过程
=[(a+1)(a-1)]/[(a-2)(a-3)]÷[(a+2)(a-1)]/(a-3)-(a+3)/[(a+2)(a-2)]
=[(a+1)(a-1)]/[(a-2)(a-3)]×(a-3)/[(a+2)(a-1)]-(a+3)/[(a+2)(a-2)]
=(a+1)/[(a+2)(a-2)]-(a+3)/[(a+2)(a-2)]
=[(a+1)-(a+3)]/(a+2)(a-2)
=-2/(a+2)(a-2)
=[(a+1)(a-1)]/[(a-2)(a-3)]×(a-3)/[(a+2)(a-1)]-(a+3)/[(a+2)(a-2)]
=(a+1)/[(a+2)(a-2)]-(a+3)/[(a+2)(a-2)]
=[(a+1)-(a+3)]/(a+2)(a-2)
=-2/(a+2)(a-2)