Question

daca a/b=6/7 calceaza b-a/b+a si 3a-2b/a+b

Answer 1

[tex]\frac{a}{b}=\frac{6}{7}\Rightarrow \frac{a}{6}=\frac{b}{7}=k\Rightarrow a=6k,b=7k;\\ \\ \frac{b-a}{b+a}=\frac{7k-6k}{7k+6k}=\frac{1}{13}\\ \\ \frac{3a-2b}{a+b}=\frac{18k-14k}{6k+7k}=\frac{4}{13}[/tex]

Answer 2

a/b=6/7
b-a/b+a=7-6/7+6=1/13
3a-2b/a+b=3*6-2*7/6+7=18-14/13=4/13