Răspuns :
x+2x+3x+4x+5x...100x=5050
5050x=5050
x=5050/5050
x=1
Solutia:(x=1)
5050x=5050
x=5050/5050
x=1
Solutia:(x=1)
x(1+2+3+4....+100)=5050
1+2+3+4+....+100=100*101:2=5050
5050*x=5050
x=1
1+2+3+4+....+100=100*101:2=5050
5050*x=5050
x=1