👤

4. Calculaţi media geometrică a numerelor a=3,5:(-0,5)¯⁴ şi b=
[tex] \frac{5}{3} - \frac{1}{7} \div \frac{9}{7} [/tex]



4 Calculaţi Media Geometrică A Numerelor A3505 Şi Btex Frac53 Frac17 Div Frac97 Tex class=

Răspuns :

Răspuns:

[tex]\frac{7}{12}[/tex]

Explicație pas cu pas:

[tex]a=3,5:(-0,5)^{-4}=\frac{35}{10} :(-\frac{5}{10})^{-4}=\frac{7}{2}:(-\frac{10}{5})^{4}[/tex]

[tex]=> a=\frac{7}{2}:(-2)^{4} =\frac{7}{2}:2^{4} =\frac{7}{2}*\frac{1}{16}=\frac{7}{32}[/tex]

[tex]b=\frac{5}{3} -\frac{1}{7}:\frac{9}{7}=\frac{5}{3}-\frac{1}{7}*\frac{7}{9}=\frac{5}{3}-\frac{1}{9}[/tex]

[tex]=> b=\frac{5*3-1}{9}=\frac{15-1}{9}=\frac{14}{9}[/tex]

Formula mediei geometrice a doua numere este: [tex]mg=\sqrt{a*b}[/tex]

[tex]=> mg=\sqrt{\frac{7}{32}*\frac{14}{9} }=\sqrt{\frac{7*7}{16*9} }=\sqrt{\frac{7^{2} }{4^{2}*3^{2} }} =\frac{7}{4*3}=\frac{7}{12}[/tex]