15分[图]一道数学化简求值题地址:http://hi.baidu.com/shmily%C6%E6%D2%D5%B9%FB/album/item/9105dc18f63a686d42a9ad1d.html如果嫌发答案过来麻烦,也可以像我这样给图,应该能看清楚吧
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/24 00:20:36
![15分[图]一道数学化简求值题地址:http://hi.baidu.com/shmily%C6%E6%D2%D5%B9%FB/album/item/9105dc18f63a686d42a9ad1d.html如果嫌发答案过来麻烦,也可以像我这样给图,应该能看清楚吧](/uploads/image/z/2990687-23-7.jpg?t=15%E5%88%86%5B%E5%9B%BE%5D%E4%B8%80%E9%81%93%E6%95%B0%E5%AD%A6%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%E9%A2%98%E5%9C%B0%E5%9D%80%EF%BC%9Ahttp%3A%2F%2Fhi.baidu.com%2Fshmily%25C6%25E6%25D2%25D5%25B9%25FB%2Falbum%2Fitem%2F9105dc18f63a686d42a9ad1d.html%E5%A6%82%E6%9E%9C%E5%AB%8C%E5%8F%91%E7%AD%94%E6%A1%88%E8%BF%87%E6%9D%A5%E9%BA%BB%E7%83%A6%2C%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%83%8F%E6%88%91%E8%BF%99%E6%A0%B7%E7%BB%99%E5%9B%BE%2C%E5%BA%94%E8%AF%A5%E8%83%BD%E7%9C%8B%E6%B8%85%E6%A5%9A%E5%90%A7)
15分[图]一道数学化简求值题地址:http://hi.baidu.com/shmily%C6%E6%D2%D5%B9%FB/album/item/9105dc18f63a686d42a9ad1d.html如果嫌发答案过来麻烦,也可以像我这样给图,应该能看清楚吧
15分[图]一道数学化简求值题
地址:
http://hi.baidu.com/shmily%C6%E6%D2%D5%B9%FB/album/item/9105dc18f63a686d42a9ad1d.html
如果嫌发答案过来麻烦,也可以像我这样给图,
应该能看清楚吧
15分[图]一道数学化简求值题地址:http://hi.baidu.com/shmily%C6%E6%D2%D5%B9%FB/album/item/9105dc18f63a686d42a9ad1d.html如果嫌发答案过来麻烦,也可以像我这样给图,应该能看清楚吧
用配方法.尽量在分子中配出分母的因式
=y/(x-y)+y^3/x(x+y)^2*(y-x)(y+x)/y(y+x)
=y/(x-y)+y^3/x(x+y)^2*(y-x)/y
=y/(x-y)+y^2(y-x)/x(x+y)^2
=[yx(x+y)^2-y^2(x-y)^2]/x(x+y)^2*(x-y)
=[yx^3+2x^2y^2+y^3x-x^2y^2+2xy^3-y^4]/x(x+y)^2*(...
全部展开
=y/(x-y)+y^3/x(x+y)^2*(y-x)(y+x)/y(y+x)
=y/(x-y)+y^3/x(x+y)^2*(y-x)/y
=y/(x-y)+y^2(y-x)/x(x+y)^2
=[yx(x+y)^2-y^2(x-y)^2]/x(x+y)^2*(x-y)
=[yx^3+2x^2y^2+y^3x-x^2y^2+2xy^3-y^4]/x(x+y)^2*(x-y)
=[xy(x+y)^2-y^2(x-y)^2]/x(x+y)^2*(x-y)
=y/(x-y)-y^2(x-y)/x(x+y)^2
=-4-200/9*35^2
=-1772/441
感觉不太对啊
收起
用配方法。尽量在分子中配出分母的因式