Question

tìm x, biết:

a, x + \(\dfrac{5}{6}=\dfrac{3}{8}\)

b, \(\dfrac{2}{3}.x-\dfrac{1}{2}=\dfrac{5}{6}\)

c, 7,5 . 2,4 + x : 2,36 = 42,3

Answer 1

\(a,x=\dfrac{3}{8}-\dfrac{5}{6}\\ x=\dfrac{17-40}{48}\\ x=-\dfrac{11}{24}\\ b,\dfrac{2}{3}x=\dfrac{5}{6}+\dfrac{1}{2}\\ \dfrac{2}{3}x=\dfrac{4}{3}\\ x=\dfrac{4}{3}:\dfrac{2}{3}\\ x=2\\ c,18+x:2,36=42,3\\ x:2,36=42,3-18\\ x:2,36=24,3\\ x=57,348\)

Answer 2

`a)x+5/6=3/8`

`x=3/8-5/6`

`x=-11/24`

__________________________________

`b)2/3x-1/2=5/6`

`2/3x=5/6+1/2`

`2/3x=4/3`

`x=4/3:2/3`

`x=2`

__________________________________

`c)7,5.2,4+x:2,36=42,3`

`18+x:2,36=42,3`

`x:2,36=42,3-18`

`x:2,36=24,3`

`x=24,3.2,36`

`x=57,348`

Answer 3

a, \(x=\dfrac{3}{8}-\dfrac{5}{6}=\dfrac{18-40}{48}=-\dfrac{11}{24}\)

b, \(\dfrac{2}{3}x=\dfrac{5}{6}+\dfrac{1}{2}=\dfrac{8}{6}=\dfrac{4}{3}\Leftrightarrow x=2\)

c, \(18+\dfrac{x}{2,36}=42,3\Leftrightarrow x=\left(42,3-18\right).2,36=57,348\)