\(\frac{a}{27}=\frac{-5}{9}=\frac{-45}{b}\)
Vì \(\frac{a}{27}=\frac{-5}{9}\Rightarrow9.a=\left(-5\right).27=-135\Rightarrow a=\frac{-135}{9}=-15\)
Vì \(\frac{-5}{9}=\frac{-45}{b}\Rightarrow-5.b=\left(-45\right).9=-405\Rightarrow b=\frac{-405}{-5}=\frac{405}{5}=81\)
Vậy a=-15;b=81
Vì \(\frac{a}{27}=\frac{-5}{9}\Rightarrow\frac{a}{27}=\frac{\left(-5\right).3}{9.3}\)
\(\Rightarrow\frac{a}{27}=\frac{-15}{27}\Rightarrow a=-15\)
Lại có: \(\frac{-5}{9}=\frac{-45}{b}\Rightarrow\frac{\left(-5\right).9}{9.9}=\frac{-45}{b}\)
\(\Rightarrow\frac{-45}{81}=\frac{-45}{b}\Rightarrow b=81\)
Vậy a=-15;b=81
a/27=-5/9=-45/b
a.9=27.(-5)
a=-15
b.(-5)=9.(-45)
b=81