\(\dfrac{x}{24}=\dfrac{5+4}{12}\)

\(\dfrac{x}{24}=\dfrac{9}{12}\)

\(x=\dfrac{9\times24}{12}=18\)

\(\Leftrightarrow\)\(\dfrac{x}{24}\)=\(\dfrac{10}{24}\)+\(\dfrac{8}{24}\)

\(\Leftrightarrow\) \(x\) = \(10+8\)

\(\Leftrightarrow\)\(x\) = 18

(\(\dfrac{2}{7}\)\(x\) + \(\dfrac{3}{7}\)): 2\(\dfrac{1}{5}\) - \(\dfrac{3}{7}\) = 1

(\(\dfrac{2}{7}x+\dfrac{3}{7}\)): 2\(\dfrac{1}{5}\) = 1 + \(\dfrac{3}{7}\)

 (\(\dfrac{2}{7}x+\dfrac{3}{7}\)): 2\(\dfrac{1}{5}\) = \(\dfrac{10}{7}\)

 \(\dfrac{2x+3}{7}\) : \(\dfrac{11}{5}\) = \(\dfrac{10}{7}\)

  \(\dfrac{2x+3}{7}\)        = \(\dfrac{10}{7}\) 

 \(\dfrac{2x+3}{7}\)          = \(\dfrac{10}{7}\times\dfrac{11}{5}\)

\(\dfrac{2x+3}{7}\)           = \(\dfrac{22}{7}\) 

2\(x\) + 3           = \(\dfrac{22}{7}\) x 7

2\(x\) + 3           = 22

2\(x\)                 = 22 - 3

2\(x\)                 = 19

\(x\)                   = \(\dfrac{19}{2}\)

Vậy \(x=\dfrac{19}{2}\)

Có 3

kThành phần của khí quyển gồm có 3 phần, bao gồm:

+) Khí ni-tơ

+) Khí ô-xy

+) Các chất khác

\(\dfrac{-5}{6}-x=\dfrac{7}{12}+\dfrac{-1}{3}\)

\(\dfrac{-5}{6}-x=\dfrac{1}{4}\)

          \(x=\dfrac{-5}{6}-\dfrac{1}{4}\)

         \(x=\dfrac{-13}{12}\)

Vậy \(x=\dfrac{-13}{12}\)

-5/6 - x = 7/12 + -4 / 12

-5/6 - x = 1/4

         x = -5/6 - 1/4

         x = -13/12

\(60\%x+\dfrac{2}{3}x=-76\\\dfrac{3}{5}x+\dfrac{2}{3}x =-76\\ x\left(\dfrac{3}{5}+\dfrac{2}{3}\right)=-76\\ x.\dfrac{3.3+2.5}{5.3}=-76\\ \dfrac{19}{15}x=-76\\ x=-76:\dfrac{19}{15}=-60\)

60% x + 2/3 x = -76

3/5 x + 2/3 x = -76

19/15 x = -76

x = -76 : 19/15

x = -60

Bạn xem lại xem biểu thức A đã viết đúng chưa vậy?

⇒What is the cost of your new school bag?

\(\Rightarrow\)\(What\) \(is\) \(the\) \(cost\) \(of\) \(your\) \(new\) \(school\) \(bag?\)