Question

tìm x 

\(\dfrac{x}{15}\) = \(\dfrac{63}{135}\)

\(\dfrac{17}{x}\) = \(\dfrac{102}{108}\)

\(\dfrac{x}{42}\) = \(\dfrac{156}{504}\)

Answer 1

`x/15 = 63/135`

`x=63/135 xx 15`

`x=7`

________________

`17/x = 102/108`

`x=17 : 102/108`

`x=18`

___________________

`x/42 = 156/504`

`x=156/504 xx 42`

`x=13`

Answer 2

\(\dfrac{x}{15}=\dfrac{63}{135}\)

x = \(\dfrac{63}{135}x15\)

x = 7

\(\dfrac{17}{x}=\dfrac{102}{108}\)

x = 17 : \(\dfrac{102}{108}\)

x = 18

\(\dfrac{x}{42}=\dfrac{156}{504}\)

x = \(\dfrac{156}{504}x42\)

x = 13