Question

B1: tìm x, y biết 

A )1/6x - 3/8=1/4.

B) 1 2/9 x +  8/3=-2/3.

C )3/4+1/4 : x = -3.

_{cần gấp ạ, giúp nhanh !}

 

Answer 1

a) \(\dfrac{1}{6}x-\dfrac{3}{8}=\dfrac{1}{4}\)
\(\dfrac{1}{6}x=\dfrac{1}{4}+\dfrac{3}{8}\)
\(\dfrac{1}{6}x=\dfrac{2}{8}+\dfrac{3}{8}\)
\(\dfrac{1}{6}x=\dfrac{5}{8}\)
\(x=\dfrac{5}{8}:\dfrac{1}{6}\)
\(x=\dfrac{5}{8}.6\)
\(x=\dfrac{15}{4}\)
Vậy......
b) \(1\dfrac{2}{9}x+\dfrac{8}{3}=\dfrac{-2}{3}\)
\(\dfrac{11}{9}x=\dfrac{-2}{3}-\dfrac{8}{3}\)
\(\dfrac{11}{9}x=\dfrac{-10}{3}\)
\(x=\dfrac{-10}{3}:\dfrac{11}{9}\)
\(x=\dfrac{-30}{11}\)
Vậy.....

Answer 2

`1/6 x - 3/8 = 1/4`

`=> 1/6 x = 1/4 + 3/8`

`=> 1/6 x = 5/8`

`=> x = 5/8 : 1/6`

`=> x = 15/4`

Vậy ...

`1` `2/9 x + 8/3 = -2/3`

`=> 1` `2/9 x =  -2/3 - 8/3`

`=> 11/9 x = -10/3`

`=> x = -10/3 : 11/9`

`=> x = -30/11`

Vậy ...

`3/4 + 1/4 : x = -3`

`=> 1/4 : x = -3 - 3/4`

`=> 1/4 : x = -15/4`

`=> x =  1/4 : (-15/4)`

`=> x = -1/15`

Vậy ...

Answer 3

c) \(\dfrac{3}{4}+\dfrac{1}{4}:x=-3\)
\(\dfrac{1}{4}x=-3-\dfrac{3}{4}\)
\(\dfrac{1}{4}x=\dfrac{-15}{4}\)
\(x=\dfrac{-15}{4}:\dfrac{1}{4}\)
\(x=\dfrac{-15}{4}.\dfrac{4}{1}\)
\(x=-15\)
Vậy...