Question

Tìm a, b biết:

\(\frac{a}{27}=\frac{-5}{9}=\frac{-45}{b}\)

Answer 1

a= -5.27/9=-15

b= -45.9/-5=81

Answer 2

\(\frac{a}{27}=\frac{-5}{9}=\frac{-45}{b}\)

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

Answer 3

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

Answer 4

a/27=-5/9=-45/b

a.9=27.(-5)

a=-15

b.(-5)=9.(-45)

b=81