Question

Calculeaza media aritmetica: 4supra 7 - 2supra5. Va rog repede.(multumesc)

Answer 1

(4/7-2/5)/2=[(20-14)/35 ]/2=6/70=3/35

Answer 2

$m_a= \frac{ \frac{4}{7} +(- \frac{2}{5} )}{2} = \frac{ \frac{20}{35} +(- \frac{14}{35} )}{2} = \frac{ \frac{6}{35} }{2} = \frac{6}{35} :2= \frac{6}{35} * \frac{1}{2}= \frac{6}{70} = \frac{3}{35}$