Question

Calculati doua nr care au raportil 0,5 si suma 75

Answer 1

Răspuns:

a+b=75

a/b=0,5=5/10=1/2=>b=2a

a+2a=75

a=75:3=>a=25

b=2×25=>b=50

Answer 2

Notăm numerele cu a și b.

$\it a+b=75 \Rightarrow a=75-b\ \ \ \ \ (1)\\ \\ \\ \dfrac{a}{b}=0,5 \Rightarrow a=0,5\cdot b \ \ \ \ \ \ \ (2)\\ \\ \\ (1),\ (2) \Rightarrow 0,5b=75-b|_{\cdot2} \Rightarrow b=150-2b \Rightarrow v+2b=150 \Rightarrow \\ \\ \\ \Rightarrow 3b=150|_{:3} \Rightarrow b=50\ \ \ \ \ (3)\\ \\ \\ (1),\ (3) \Rightarrow a=75-50 \Rightarrow a=25$