> 数学 >
若x=根号2 减1,则x+x的负一次方=?
人气:492 ℃ 时间:2019-12-23 13:29:42
解答
x=√2-1
x+x^1
=x+1/x
=√2-1+1/(√2-1)
=√2-1+(√2+1)/(√2-1)(√2+1)
=√2-1+(√2+1)/(2-1)
=√2-1+√2+1
=2√2
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版