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Suma inverselor R9 + R8 si R8 - R7 este...
R= radical


Răspuns :

1/(√9+√8) + 1/(√8-√7) = (√9-√8)/(√9²-√8²) + (√8+√7)/(√8²-√7²)=
(3-2√2)/(9-8) + (2√2+√7)/(8-7) = 3-2√2 + 2√2+√7 = 3+√7