九上二次根式,求高手再帮我做一遍
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/24 23:49:22
九上二次根式,
![](http://img.wesiedu.com/upload/7/cb/7cbe78eeee462ae04ea10b41b6e8c38f.jpg)
求高手再帮我做一遍
![](http://img.wesiedu.com/upload/7/cb/7cbe78eeee462ae04ea10b41b6e8c38f.jpg)
求高手再帮我做一遍
![九上二次根式,求高手再帮我做一遍](/uploads/image/z/16074564-60-4.jpg?t=%E4%B9%9D%E4%B8%8A%E4%BA%8C%E6%AC%A1%E6%A0%B9%E5%BC%8F%2C%E6%B1%82%E9%AB%98%E6%89%8B%E5%86%8D%E5%B8%AE%E6%88%91%E5%81%9A%E4%B8%80%E9%81%8D)
(7)原式=(2倍根号6-3倍根号15+2倍根号(8/3))*根号2
=2倍根号12-3倍根号30+2倍根号(16/3)
=4倍根号3-2倍根号30+(8/3倍根号3)
=(20/3-根号10)倍根号3
另外,你做的没错
(8)原式=(3倍根号3-2倍根号6+4倍根号3)/2倍根号3
=(7-2倍根号2)倍根号3/2倍根号3
=(7-2倍根号2)/2
=2倍根号12-3倍根号30+2倍根号(16/3)
=4倍根号3-2倍根号30+(8/3倍根号3)
=(20/3-根号10)倍根号3
另外,你做的没错
(8)原式=(3倍根号3-2倍根号6+4倍根号3)/2倍根号3
=(7-2倍根号2)倍根号3/2倍根号3
=(7-2倍根号2)/2