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x+2x+3x+.....+100x=1000

Răspuns :

x+2x+3x+...+100x=1000
x(1+2+3+...+100)=1000 se observa Suma Gauss
x(100×101/2)=1000
x·50·101=1000
5050x=1000
x=1000/5050=100/505=20/101
x=20/101
Spor la lucru in continuare!