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1/25+2/25+3/25+.......24/25=?
Dau coroana!!!




Răspuns :

1 / 25 + 2 / 25 + 3 / 25 + ... + 24 / 25 =

( 1 + 2 + 3 + ... + 24 ) / 25 =

( 24 × 25 : 2 ) / 25 =

( 600 : 2 ) / 25 =

300 / 25 =

12 / 1 = 12