Răspuns :
a=numarul
[tex]a+ \frac{2}{3} a=30\\\\ 3a+2a=90\\ 5a=90\\ a=90:5\\ a=18[/tex]
[tex]a+ \frac{2}{3} a=30\\\\ 3a+2a=90\\ 5a=90\\ a=90:5\\ a=18[/tex]
x=nr. natural
x+(2/3)*x=30 (amplificam cu 3 primul x si pe 30)
3x+2x=90
x=90:5
⇒x=18
Verificare:
18+2*18:3=30
18+36:3=30
18+12=30
30=30
Succes!!!
x+(2/3)*x=30 (amplificam cu 3 primul x si pe 30)
3x+2x=90
x=90:5
⇒x=18
Verificare:
18+2*18:3=30
18+36:3=30
18+12=30
30=30
Succes!!!
