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x+(1+2+3+4+...+49)=1625 a 1200,b 400,c 1225,d250

Răspuns :

Rodi11
x+(1+2+3+4+...+49)=1625
x+{[49×(49+1)]:2]=1625
x+[(49×50):2]=1625
x+(2450:2)=1625
x+1225=1625
x=1625-1225
x=400

răspuns corect b) 400
Beiweiwei
X+49×50=1625
X+1225=1625
X=1625-1225
X=400

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