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2014-10-15T21:34:46+03:00
X+2x+3x+...+100x=50500
x(1+2+3+...+100)=50500
x*5050=50500
x=50500:5050
x=10
de unde lai luat pe 5050
1+2+3+...+100=(1+100)+(2+99)+...+(50+51)=101+101+...+101 de 50 ori=101x50=5050
mersi multt de tot acum am inteles,mersi