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2014-10-21T21:47:27+03:00
Dam x factor comun: X(1+2+3+...+100)=X(100×101:2)=5050x=50500 ⇒x=50500:5050 ; x=10 

:P


1 5 1
2014-10-21T21:48:21+03:00
(100 *101x ) :2 =50500
10100x : 2 =50500
5050x= 50500
x=10