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diagonala unui paralipiped dreptunghic cu dimensiunile de 6cm,8cm,24cm are lungimea egala cu..... cm.

Răspuns :

d=√(6²+8²+24²)=√(100+576)=√676=26
as simple as that!
D = √(L²+l²+h²) = √(36+64+576) = √676 = √2²13² = 2x13 =26 cm
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q.e.d.