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数学
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八年级数学题(还未教一元两次方程)
已知:x+1/x=6
求√x+1/√x的值
人气:165 ℃ 时间:2020-05-08 03:06:18
解答
(√x+1/√x)²
=(√x)²+2×√x×1/√x+(1/√x)²
=x+2+1/x
=6+2
=8
所以√x+1/√x=-2√2或√x+1/√x=2√2
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