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Calculati:
a)1\25+2\25+3\25+...+75\25=



Răspuns :

)1\25+2\25+3\25+...+75\25= [(75 x 76): 2] / 25 = 75 x 38 / 25 = 3 x 38 = 114 
[tex] \frac{1}{25} + \frac{2}{25} +...+ \frac{75}{25} = \frac{(1+2+..+75)}{25}= \frac{75*76:2}{25}= \frac{2850}{25} = = 114[/tex]