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Calculeaza 1+2+3+4+.......+100

Răspuns :

100 x 101 : 2 =
10 100 : 2 =
5 050

Un mic ajutor )
http://www.calculator.net/binary-calculator.html?number1=&c2op=%2B&number2=&calctype=op&x=107&y=7