Question

Tìm x; y

a) 5/x = y/-15 = 2/10

b) x/-6 = 4/y = 3/9

Answer 1

a)5/x=2/10

<=>2x=5.10

<=>2x=50

<=>x=25

=>5/25=y/-15

=>y/-15=1/5

=>y=-15/5=-3

b)x/-6=3/9

<=>x/-6=1/3

<=>x/-6=2/6=-2/-6

<=>x=-2

4/y=3/9

<=>4/y=1/3

<=>4/y=4/12

<=>y=12

Answer 2

a,\(\frac{5}{x}=\frac{y}{-15}=\frac{2}{10}\)

\(\frac{2}{10}=\frac{1}{5}\)

Nên Ta có:

\(\frac{5}{x}=\frac{y}{-15}=\frac{1}{5}\)

<=> x = 5.5

<=> x = 25

Vậy, x = 25

<=> 5y = -15

<=> y = -15:5

<=> y = -3

Vậy, y = -3

b,  \(\frac{x}{6}=\frac{4}{y}=\frac{3}{9}\)

Mà \(\frac{3}{9}=\frac{1}{3}\)

Nên Ta có: 

\(\frac{x}{6}=\frac{4}{y}=\frac{1}{3}\)

<=> 3x=6

<=> x = 6:3

<=> x = 2

Vậy, x = 2

<=> y = 4.3

<=> y =12

Vậy, y = 12