
已知x+1=√5x,求√x2/x4+x2+1 -√x/x2+3x+1
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x+1=√5x
(x+1)²=(√5x)²
x²+2x+1=5x
即x²+1=3x
√x2/x4+x2+1 -√x/x2+3x+1
=√x²/((x²+1)²-x²)-√x/(x²+1+3x)
=√x²/((3x)²-x²)-√x/(3x+3x)
=√1/8-√1/6
=(√2)/4-(√6)/6
=(3√2-2√6)/12
(x+1)²=(√5x)²
x²+2x+1=5x
即x²+1=3x
√x2/x4+x2+1 -√x/x2+3x+1
=√x²/((x²+1)²-x²)-√x/(x²+1+3x)
=√x²/((3x)²-x²)-√x/(3x+3x)
=√1/8-√1/6
=(√2)/4-(√6)/6
=(3√2-2√6)/12
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