[x+x:(1-5/6)]:7/12 = [x+x:(6-5)/6]*12/7=
= [ x + x/6 ]*12/7 =
= 7x/6 * 12/7 = ... simplificat cu 7 si 6 ...
= 2x ;
(1/2+1/3+1/4+...+ 1 / 2014) +
(1/2+2/3+3/4+...+2013/2014) adunat termen cu termeni , obtinem...
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1 + 1 + 1 +...+ 1 = 2013 * 1 = 2013 ;