Question

calculati media aritmetica a numerelor reale a si b,daca: a=3√5[4,(2)-1,44*0,05] (3,1/4): (-5/8)..b=3,(25)-4[-2,1(15)-7:(-33)]+7√5

Answer 1

a=1.25:0,05-2$\sqrt{7}$*(-2,5-4,8)=?

=$1 \frac{1}{4} : \frac{5}{100} -2 \sqrt{7} *(-2 \frac{1}{2} -4 \frac{4}{5} )=$
$1) -2 \frac{1}{2} -4 \frac{4}{5} =- \frac{5}{2} - \frac{24}{5} = -\frac{25}{10} - \frac{48}{10} =- \frac{73}{10}$
$2) \frac{5}{4} : \frac{5}{100} = \frac{5}{14} * \frac{100}{5} = \frac{100}{14}$
$3)2 \sqrt{7} *(- \frac{73}{10} )=2 \sqrt{7} *(-7,3)=-14,6 \sqrt{7}$
$4) \frac{100}{14} +14,6 \sqrt{7}$
asta e raspunsul pentru a(punctul a), urmeaza exemplul si fa-l si pe b(a si b), apoi aduna-le,si imparte la 2. voila asta e raspunsul