早教吧 育儿知识 作业答案 考试题库 百科 知识分享

约分①(x+y)y/xy²③x²+xy/(x+y)²④x²-y²/(x-y)²求正确答案过程

题目详情
约分①(x+y)y/xy²③x²+xy/(x+y)²④x²-y²/(x-y)²求正确答案过程
▼优质解答
答案和解析
①(x+y)y/xy²=x+y/xy
③ x²+xy/(x+y)²=x(x+y)/(x+y)²=x/x+y
④ x²-y²/(x-y)²=(x+y)(x-y)/(x-y)²=x+y/(x-y)