Question

1pe 2 - 3pe 4:9pe 8 = rezolvare completa 

Media aritmetica a nr : 2,5 ; 5,4si 1,1 = 

alflati media artmetica a nr a si b , unde a=1 pe 10+2pe11+....+1991pe 2000 si b = 9pe 10 +9pe11+...+9pe 2000 = ? 

Answer 1

$\frac{1}{2} - \frac{3}{4} : \frac{9}{8} =\frac{1}{2} - \frac{3}{4} * \frac{8}{9}=\frac{1}{2} - \frac{2}{3}= \frac{3*1-2*2}{6} = \frac{3-4}{6} =- \frac{1}{6} =-0,1(6)$

$M_{aritmetica} = \frac{2,5+5,4+1,1}{3} = \frac{9}{3} =3$