Question

tìm x 

X x 3và1/2 = 4và3/4 

X : 2và2/3 = 4 và1/4 

mik cần bài này gấp ạ 

Answer 1

`x xx 3 1/2 = 4 3/4`

`x xx7/2 = 19/4`

`x=19/4 : 7/2`

`x=19/4 xx 2/7`

`x=19/14`

Vậy `x=19/14`

____________________________

`x : 2 2/3 =4 1/4`

`x: 8/3 = 17/4`

`x=17/4 xx 8/3`

`x=34/3`

Vậy `x=34/3`

Answer 2

a: \(\Leftrightarrow x\cdot\dfrac{7}{2}=\dfrac{19}{4}\)

\(\Leftrightarrow x=\dfrac{19}{4}:\dfrac{7}{2}=\dfrac{19}{4}\cdot\dfrac{2}{7}=\dfrac{19}{14}\)

b: \(\Leftrightarrow x:\dfrac{8}{3}=\dfrac{17}{4}\)

\(\Leftrightarrow x=\dfrac{17}{4}\cdot\dfrac{8}{3}=\dfrac{34}{3}\)