Question

Daca a-b= 2 si 1/a-1/b= 6, atunci a*b= ??

Answer 1

[tex]a-b=2|(-1)=\ \textgreater \ b-a=-2\\ \frac{1}{a}-\frac{1}{b}=6\\ \frac{b-a}{ab}=6\\ \frac{-2}{ab}=6\\ 6ab=-2=\ \textgreater \ ab=-\frac{1}{3}[/tex]