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X+2x+3x+....+50x=10200

Răspuns :

Factor comun si Suma lui Gauss :

x·(1+2+3+.......+50)=10200
x·[50·(50+1):2]=10200
x·(50·51:2)=10200
x·(2550:2)=10200
x·1275=10200
x=10200:1275
x=8