Question

media aritmetica a doua nr rationale pozitive este 10,5 iar raportul lor este 0,75 . aflati numerele.

Answer 1

fie a si b nr.
0.75=3/4, deci a=3k si b=4k
3k+4k/2=10.5
7k/2=10.5
7k=2*10.5
7k=21
k=3

a=3k=3*3=9
b=4k=3*4=12

Answer 2

$\dfrac{a+b}{2}=10,5 \Longrightarrow a+b=21$

$\dfrac{a}{b} =0.75 \Longrightarrow \dfrac{a}{b}=\dfrac34 \Longrightarrow \dfrac{a+b}{b} =\dfrac{3+4}{4} \Longrightarrow \dfrac{21}{b}=\dfrac74$