=√(x²+2+1/x²+12)
=√[(x+1/x)²+12]
=√{[(√x+1/√x)²-2]²+12}
=√16
=4
已知根号X-根号X分之一=2,求根号(X的平方+X的平方分之一+14的值
已知根号X-根号X分之一=2,求根号(X的平方+X的平方分之一+14的值
数学人气:814 ℃时间:2019-08-20 14:05:52
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