1.已知X^2+1/X^2=3,求X+1/x的值2.若|2A-5|与根号B+2互为相反数,求AB的值
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![1.已知X^2+1/X^2=3,求X+1/x的值2.若|2A-5|与根号B+2互为相反数,求AB的值](/uploads/image/z/2533696-16-6.jpg?t=1.%E5%B7%B2%E7%9F%A5X%5E2%2B1%2FX%5E2%3D3%2C%E6%B1%82X%2B1%2Fx%E7%9A%84%E5%80%BC2.%E8%8B%A5%7C2A-5%7C%E4%B8%8E%E6%A0%B9%E5%8F%B7B%2B2%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E6%B1%82AB%E7%9A%84%E5%80%BC)
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1.已知X^2+1/X^2=3,求X+1/x的值2.若|2A-5|与根号B+2互为相反数,求AB的值
1.已知X^2+1/X^2=3,求X+1/x的值2.若|2A-5|与根号B+2互为相反数,求AB的值
1.已知X^2+1/X^2=3,求X+1/x的值2.若|2A-5|与根号B+2互为相反数,求AB的值
设z^2=(x+1/x)^2=X^2+1/X^2+2=3+2=5
X+1/x=z=+根号5or-根号5
|2A-5|+根号B+2=0
所以2A-5=0 A=5/2
B+2=0 B=-2