Question

[Nguyễn Thị Huyền Trang]

Tìm x,y:

a.42/54=7/x

b.x/15=-2/3

c.x/27=-5/9=-45/y

Answer 1

[Huyen Phamen]

a,\(\dfrac{42}{54}\)=\(\dfrac{7}{x}\)

\(\dfrac{7}{9}\)=\(\dfrac{7}{x}\)

⇒x=9

b,\(\dfrac{x}{15}\)=\(\dfrac{-2}{3}\)

\(\dfrac{x}{15}\)=\(\dfrac{-10}{15}\)

⇒x=-10