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!!!!!!!!!!!!!! 2in1 !!!!!!!!!!! Urgent !!!! 
1) Calculati media aritmetica a numerelor: a=[tex]8-3 \sqrt{7} + \frac{1}{2} (3+ \sqrt{7} ) ^{2} [/tex] si b=24. 

2) O firma are 120 de angajati. Determinati numarul barbatilor angajati in firma , stiind ca numarul femeilor reprezinta 20% din numarul barbatilor . 

MULTUMESC!


Răspuns :

[tex]a=8-3\sqrt7+\dfrac12(9+6\sqrt7+7)[/tex]

[tex]a=8-3\sqrt7+\dfrac12(16+6\sqrt7)[/tex]

[tex]a=8-3\sqrt7+8+3\sqrt7=16[/tex]

[tex]m_a=\dfrac{a+b}{2}=\dfrac{16+24}{2}=20[/tex]

2)

x= numarul barbatilor

20x/100=x/5=nr. femeilor

x+x/5=120

6x=120·5

x=20·5=100 barbati

Femei= 100/5=20