a^2-5a-1=0,则a^2+1/a^2=?

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/28 06:03:33
a^2-5a-1=0,则a^2+1/a^2=?a^2-5a-1=0,则a^2+1/a^2=?a^2-5a-1=0,则a^2+1/a^2=?a²-5a-1=0→a-1/a=5→(a-1/a)&

a^2-5a-1=0,则a^2+1/a^2=?
a^2-5a-1=0,则a^2+1/a^2=?

a^2-5a-1=0,则a^2+1/a^2=?
a²-5a-1=0
→a-1/a=5
→(a-1/a)²=25
a²+1/a²=27.