Question

Calculati media aritmetica a numerelor :2$\frac{2}{5} si \frac{7}{10}$.
Calculati x=($( \frac{1}{14} +\frac{1}{42} + \frac{1}{84} ... + \frac{1}{924} ) :1 \frac{5}{28}$ 


                                   

Answer 1

Ma=(2/5+7/10)/2=[(10+7)/10]/2=17/10·1/2=17/20=0,85
1intreg 5/28=33/28=33/14·2
x=(1/14++1/42+1/84+....+1/924)·28/33
x=(28/14·33+28/42·33+28/84·33+....28/924·33)
x=(2/33+2/66+2/99+....2/2178)
x=(2/33+1/33+2/99+....1/1089)
x=(3/33+2/99+....+1/1089)
x=(1/11+2/99+.....1/1089)