化简1⼀a+根号(1⼀a^2+a ^2-2),其中a=1⼀5

2025-05-08 23:12:23
推荐回答(1个)
回答1:

1/a+根号(1/a^2+a ^2-2),
=1/a+√(1/a²+a²-2)
=1/a+√(1/a-a)²
=1/a+1/a-a
=2/a-a
=10-1/5
=49/5;