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2014-11-14T11:35:42+02:00
2x+4x+6x+........+100x+102=x+3x+5x+........+101x2x(1+2+3+...50)=x(1+3+5+...101)
2x·50·51:2=x(50+1)²
50·51x==51²·x
50·x=51·x
51x-50x=0
x=0


11+12+13+100=5*(1000x-1)
136=5000x-5
136+5=5000x
141=5000x
x=141:5000
x=0,0282