x=2-根号2,x-根号2的绝对值加x分之2等于?_数学解答

x=2-根号2,x-根号2的绝对值加x分之2等于?

人气：241 ℃　时间：2019-12-19 23:48:27

解答

x=2-√2
|x-√2|+2/x
=|(2-√2)- √2|+2/(2-√2)
=|2-2√2|+2(2+√2)/[(2-√2)(2+√2)]
=2√2-2+2+√2
=3√2.