Question

Daca 3/a=b/9, aflati ab/ab+3​

Answer 1

Buna! Ai rezolvarea in poza

Answer 2

Explicație pas cu pas:

$\dfrac{3}{a} = \dfrac{b}{9} \iff ab = 3 \cdot 9 = 27$

$\dfrac{ab}{ab + 3} = \dfrac{27}{27 + 3} = \dfrac{27 ^{(3} }{30} = \dfrac{9}{10}$