Question

Answer 1

\(\dfrac{3}{x+3}=\dfrac{15}{55}\)

nên x+3=11

hay x=8

Answer 2

\(\dfrac{3}{x+3}=\dfrac{3}{11}\)

\(3:\left(x+3\right)=\dfrac{3}{11}\)

\(x+3=3:\dfrac{3}{11}\)

\(x+3=11\)

\(x=8\)

Answer 3

=> ( X + 3 ) x 15 = 3 x 55

=>( X + 3 ) x 15  = 165

=> X + 3 =  165 : 15

=> X + 3 = 11

=>  X = 8

Answer 4

15/55 = 15 : 3 = 5, 55 : 5 = 11 - 3 = 8

Answer 5

`x=8`

Answer 6

\(\dfrac{3}{x+3}=\dfrac{15}{55}\\ \dfrac{3}{x+3}=\dfrac{3}{11}\)

`<=>(x+3)xx3=3xx11`

`(x+3)xx3=33`

`x+3=11`

`x=8`

Vậy `x=8`

`@An`