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Suma gaus 25+50+75+....+800

Răspuns :

=25(1+2+3+,,,,,,,+32)
=25(32x33):2
=25(1056:2)
=25x528
=13.200
25+50+75+....+800 = 
25 (1+2+3+.....+ 32) =
25 ( 32 x 33 : 2 ) =
25 x 528 = 
13200