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fie a=radical 121 +(2 + 4 +6 +.....+240 ) determinati ca radical din a apartine N URGGGGG


Răspuns :

a=radica[121+2(1+2+3+..+120)]=radical[121+2(120*121:2)]=radical(121+121*120)=radical(121+14520)=radical(14641)=121 apartine lui N