Question

\(\frac{7}{x}\)=\(\frac{y}{27}\)=\(\frac{-42}{54}\)

tìm x và y

Answer 1

Ta có:

\(\frac{y}{27}=\frac{-42}{54}\)

\(\Rightarrow y=\frac{-42.27}{54}=-21\)

Lại có:

\(\frac{7}{x}=\frac{-21}{27}\)

\(\Rightarrow x=\frac{7.27}{-21}=-9\)

Vậy .....

Answer 2

Tìm x:

 \(\frac{7}{x}\)= \(\frac{-42}{54}\)

\(\Rightarrow\)\(\frac{7.\left(-6\right)}{x.\left(-6\right)}\) = \(\frac{-42}{54}\)

\(\Rightarrow\)\(x.\left(-6\right)=54\)

\(\Rightarrow x=54\div\left(-6\right)\)

\(\Rightarrow x=-9\)

Tìm y:

\(\frac{y}{27}=\frac{-42}{54}\)

\(\Rightarrow\frac{y.2}{27.2}=\frac{-42}{54}\)

\(\Rightarrow y.2=-42\)

\(\Rightarrow y=\left(-42\right)\div2\)

\(\Rightarrow y=-21\)

\(Họctốtnhé\)

Answer 3

\(\frac{7}{x}=\frac{y}{27}=\frac{-42}{54}\)

Ta có:

\(\frac{7}{x}=\frac{-42}{54}\)

\(\Rightarrow\frac{7}{x}=\frac{-7}{9}\)

\(\Rightarrow-7.x=7.9\)

\(\Rightarrow-7.x=63\)

\(\Rightarrow x=63:\left(-7\right)=-9\)

\(\frac{y}{27}=\frac{-42}{54}\)

\(\Rightarrow\frac{y}{27}=\frac{-7}{9}\)

\(\Rightarrow9.y=-7.27\)

\(\Rightarrow9.y=-189\)

\(\Rightarrow y=-189:9=-21\)

Vậy x = -9; y = -21