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media aritmetica 15x; x 13 si 3x este 17 calculati x

Răspuns :

[tex]m_a_(_1_5_x_;_1_3_x_;_3_x)=17\\\\ =\ \textgreater \ 17= \frac{15x+13x+3x}{3} \\\\ =\ \textgreater \ 17= \frac{31x}{3} =\ \textgreater \ 31x=51=\ \textgreater \ x=1,64 [/tex]