Răspuns:
Explicație pas cu pas:
a=primul nr.
b=al doilea nr.
c= al treilea nr.
a+b+c=642
a= [tex]\frac{3b}{4} -18[/tex]
b= [tex]\frac{2c}{3} -24[/tex]
[tex]b+24=\frac{2c}{3} \\=> 3b+72=2c\\=> c=\frac{3b}{2} +36[/tex]
Acum inlocuim in suma
[tex]\frac{3b}{4} -18+b+\frac{3b}{2} +36=642\\\frac{3b}{4} +\frac{3b}{2} +b=624\\3b+6b+4b=2496\\13b=2496 => b=192[/tex]
[tex]a= \frac{3b}{4} -18=\frac{3*192}{4} -18=3*48-18=126[/tex]
[tex]c=\frac{3b}{2}+36 =\frac{3*192}{2}+36 =3*96+36=324[/tex]
