求答案,要过程,最好能是图片
4个回答
2013-09-13
展开全部
1)a²/ab(a-b)-b²/ab(a-b)=(a²-b²)/ab(a-b)=(a+b)/ab=1/b+1/a
2) {(a+b)/ab} / (a+b)=1/ab
3) 1/{2(3x-2y)}-1/{2(3x+2y)}+2y/{(2y+3x)(2y-3x)}
={(3x+2y)-(3x-2y)}/{2(3x+2y)(3x-2y)}+2y/{(2y+3x)(2y-3x)}
=4y/{2(3x+2y)(3x-2y)}+2y/{(2y+3x)(2y-3x)}
=2y/(9x²-4y²)+2y/(4y²-9x²)=0
2) {(a+b)/ab} / (a+b)=1/ab
3) 1/{2(3x-2y)}-1/{2(3x+2y)}+2y/{(2y+3x)(2y-3x)}
={(3x+2y)-(3x-2y)}/{2(3x+2y)(3x-2y)}+2y/{(2y+3x)(2y-3x)}
=4y/{2(3x+2y)(3x-2y)}+2y/{(2y+3x)(2y-3x)}
=2y/(9x²-4y²)+2y/(4y²-9x²)=0
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询