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seremet
2015-11-06 12:46:09
(5+10+15+20+25+........100)-5*(1+2+.......+20) (7+14+21+.......+91):(1+2+3+........+13) DAU COROANA !
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bestchoice38
2015-11-06 19:21:27

(5+10+15+20+25+........100)-5*(1+2+.......+20)=5(1+2+...+20)-5(1+2+...+20)=0 (7+14+21+.......+91):(1+2+3+........+13)=7(1+2+3+...+13):(1+2+3+...+13)=7

mihneac
2015-11-06 19:22:42

(5+10+...+100)-5*(1+2+...+20)= 5*(1+2+...+20)-5*(1+2+...+20)=0 (7+14+...+91):(1+2+...+13)= 7*(1+2+...+13):(1+2+...+13)=7*1=7                                  

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