Question

Va rog ajutati ma la exercitiul 8
Dau coroana!!

Answer 1

Răspuns:

(2a+b)/(3a+2b)=2/3 produsul extremilor este egal cu produsul mezilor

3(2a+b)=2(3a+2b)

6a+3b=6a+4b

6a-6a=4b-3b=>b=0

Answer 2

$\it \dfrac{2a+b}{3a+2b}=\dfrac{2}{3}\ \Rightarrow\ 3\cdot(2a+b)=2\cdot(3a+2b)\Rightarrow\\ \\ \\ \Rightarrow\ 6a+3b=6a+4b|_{-6a}\ \Rightarrow\ 3b=4b\ \Rightarrow\ 4b=3b\ \Rightarrow4b-3b=0\ \Rightarrow\ b=0$