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x-1/x=2
atunci:
x²+1/x²=?


Răspuns :

x-1/x=2 => x-1=2x => x=-1

=> x²+1/x²=(1+1)/1=2/1=2
X-1/x=2 2x=x-1 2x-x=1 X=1 deci x patrat +1/x patrat= 1 la puterea a doua+1/1 la puterea a doua= 1+1/1=2/1=2