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repede !!! dau coroana

Repede Dau Coroana class=

Răspuns :

=[rad(6/9) + 3/rad3]*rad3 + [rad(4/9)+ 5/7rad2 ] *rad2 = [(rad6)/3+3/rad3]*rad3 +(2/3+5/7rad2) *rad2= (3rad2)/3 + 3 + (2rad2)/3+ 5/7 = rad2 +3 + 2rad2/3 + 5/7 (aduci la acelasi numitor, 21) = (21rad2 + 63 + 14rad2 +15)/21 = (35rad2 + 78)/21