若x分之1-x的绝对值=1,则x分之1+x的绝对值=?
会的人帮帮啊!
人气:164 ℃ 时间:2020-06-14 17:14:05
解答
|1/x-x|=1
平方
1/x²-2+x²=1
1/x²+x²=3
(1/x+x)²
=1/x²+2+x²
=3+2=5
所以 |1/x+x|=√5
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