a+1分之a-a的平方-1分之a-2除以a的平方-2a+1分之a的平方-2a

2024-12-18 21:41:09
推荐回答(2个)
回答1:

原式=[a/(a+1)]-[(a-2)/(a²-1)]÷[(a²-2a)/(a²-2a+1)]
=[a/(a+1)]-[(a-2)/(a²-1)]÷[a(a-2)/(a-1)²]
=[a/(a+1)]-[(a-2)/(a²-1)]×{ (a-1)²/[a(a-2)] }
=[a/(a+1)]- { (a-2)/[(a+1)(a-1)] }×{ (a-1)²/[a(a-2)] }
=[a/(a+1)]-{ (a-1)/[a(a+1)] }
={ a²/[a(a+1)] }-{ (a-1)/[a(a+1)] }
=[a²-(a-1)]/[a(a+1)]
=(a²-a+1)/(a²+a)

回答2:

请问,你的数学语言表述是否错了?如:1分之a-2除以a的平方-2a+1分之a的平方-2a不好列式,因为任何数被一分子就是任何数。