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X²+1/X²=79
X²+1+X²/X²+1-X²=79+1/79-1. {addeondo & dividendo}
2X²+1/1=80/78
78(2x²+1)=80
156X²+78=80
156x²=2
X=√2/156
X=√1/78
X²+1+X²/X²+1-X²=79+1/79-1. {addeondo & dividendo}
2X²+1/1=80/78
78(2x²+1)=80
156X²+78=80
156x²=2
X=√2/156
X=√1/78
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