x-1/x=1(x>0)则x^4-1/x^4=?答案是3根号5

来源:学生作业帮助网 编辑:作业帮 时间:2024/12/01 01:36:56
x-1/x=1(x>0)则x^4-1/x^4=?答案是3根号5
x)xPP@i̊8PS-x6c;o7I*'S~ yiT5l lDE6HT Lh6hs2H%X=@]0ڧ<ٱ L';d>ڪW w6<ٽ!doqAb/

x-1/x=1(x>0)则x^4-1/x^4=?答案是3根号5
x-1/x=1(x>0)则x^4-1/x^4=?
答案是3根号5

x-1/x=1(x>0)则x^4-1/x^4=?答案是3根号5
(x-1/x)^2=1 => x^2+1/x^2=3
(x^2+1/x^2)^2=9 => x^4+1/x^4=7
(x^4+1/x^4)^2=49 => (x^4-1/x^4)^2=45
因为x>0,且x-1/x>0,故,x^4-1/x^4>0,所以,x^4-1/x^4=3根号5