若x²-4x+1=0,求下列代数式的值:(1)x+x分之1 (2)x²+x²分之1最好写的清楚点,让我搞懂!
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若x²-4x+1=0,求下列代数式的值:(1)x+x分之1 (2)x²+x²分之1最好写的清楚点,让我搞懂!
若x²-4x+1=0,求下列代数式的值:(1)x+x分之1 (2)x²+x²分之1
最好写的清楚点,让我搞懂!
若x²-4x+1=0,求下列代数式的值:(1)x+x分之1 (2)x²+x²分之1最好写的清楚点,让我搞懂!
x²-4x+1=0
x²/x-4x/x+1/x=0
x+1/x=4
x²+x²分之1
=(x+1/x)²-2
=4²-2
=14