Răspuns :
a;b→ numere
a+b=20
a=[tex]\dfrac{2}{3}[/tex]·b
[tex]\dfrac{2}{3}[/tex]·b+b=20
[tex]\dfrac{2b+3b}{3}[/tex]=20
[tex]\dfrac{5b}{3}[/tex]=20
5b=20·3
5b=60=>b=[tex]\dfrac{60}{5}[/tex]=12
a+12=20=>a=20-12=8
Proba
8+12=20
a+b=20
a=[tex]\dfrac{2}{3}[/tex]·b
[tex]\dfrac{2}{3}[/tex]·b+b=20
[tex]\dfrac{2b+3b}{3}[/tex]=20
[tex]\dfrac{5b}{3}[/tex]=20
5b=20·3
5b=60=>b=[tex]\dfrac{60}{5}[/tex]=12
a+12=20=>a=20-12=8
Proba
8+12=20
[tex]a,b - nr.[/tex]
[tex]a + b = 20[/tex]
[tex]a = \frac{2}{3} \times b[/tex]
[tex]a = \frac{2b}{3} [/tex]
[tex] \frac{2b}{3} + b = 20 \: | \times 3[/tex]
[tex]2b + 3b = 60[/tex]
[tex]5b = 60[/tex]
[tex]b = \frac{60}{5} [/tex]
[tex]b = 12[/tex]
[tex]a = \frac{2b}{3} [/tex]
[tex]a = \frac{2 \times 12}{3} [/tex]
[tex]a = \frac{24}{3} [/tex]
[tex]a = 8[/tex]
[tex]a + b = 20[/tex]
[tex]a = \frac{2}{3} \times b[/tex]
[tex]a = \frac{2b}{3} [/tex]
[tex] \frac{2b}{3} + b = 20 \: | \times 3[/tex]
[tex]2b + 3b = 60[/tex]
[tex]5b = 60[/tex]
[tex]b = \frac{60}{5} [/tex]
[tex]b = 12[/tex]
[tex]a = \frac{2b}{3} [/tex]
[tex]a = \frac{2 \times 12}{3} [/tex]
[tex]a = \frac{24}{3} [/tex]
[tex]a = 8[/tex]