Question

exercitiul 3a va rog,dau coroană

Answer 1

trei patrimi - înseamna 3/4

sfetul unui numar-  inseama n/4

$\bf \dfrac{3}{4}\cdot\dfrac{n}{4} =20\:\:|\cdot 16$

$\bf 3n=20\cdot16$

3n = 320

n = 320 : 3

n = 106,66

Answer 2

$\it Fie\ x-\ num\breve{a}rul\ cerut.\\ \\ \dfrac{3}{4}\ din\ \dfrac{x}{4}=20 \Rightarrow \dfrac{3}{4}\cdot \dfrac{x}{4}=20 \Rightarrow \dfrac{3}{16}x=20 \Rightarrow x=20\cdot \dfrac{16}{3} \Rightarrow x= \dfrac{320}{3}=106 \dfrac{2}{3}$