Question

Stiind ca nr a si b sunt d.p. cu nr 3,4 si a+b=21

Answer 1

   
3 + 4 = 7
k = 21 : 7 = 3
a = 3k = 3 × 3 = 9
b = 4k = 4 × 3 = 12

Solutia:  a = 9 si b = 12

Verificare 1:
a / b = 9 / 12 = 3/4

Verificare 2:
a + b = 9 + 12 = 21

Answer 2

{ a,b} d.p { 3,4}
a+b= 21
a/3=b/4 = k
a= 3k
b= 4k
3k +4k = 21
7k = 21
k= 21:7
k= 3
a= 3*3
a= 9
b= 3*4
b= 12