1

\(\dfrac{22}{5}\) x \(\dfrac{21}{22}\) x \(\dfrac{5}{21}\)

= \(\dfrac{5}{5}\) = 1

Tick cho mik nha

1

a,x:4/5=25/4:5/4

 x:4/5=5

      x=5.4/5

      x=4

Vậy x=4

(lưu ý:dấu . có nghĩa là dấu nhân bạn nhé)

b,22/5:x=22/30:2/5

  22/5:x=11/6

         x=22/5:11/6

         x=12/5

Vậy x=12/5

a.x:1/5=25/4:5/4

5x/4=25/4.4/5

5x/4=5

5x=20

x=4

a) x :  \(\frac{4}{5}\) = \(\frac{25}{4}\): \(\frac{5}{4}\)

    x : \(\frac{4}{5}\)   = 5

           x        = 5 x \(\frac{4}{5}\)

          x         = 4

b) \(\frac{22}{5}\): x = \(\frac{22}{30}\): \(\frac{2}{5}\)

     ​\(\frac{22}{5}\)​ : x = \(\frac{11}{10}\)

                   x = \(\frac{22}{5}\) : \(\frac{11}{10}\)

                   x =  \(\frac{22}{5}\)

55/6 nha

\(\frac{5}{11}\times\frac{5}{22}\times22\times\frac{11}{5}\)

\(=\left(\frac{5}{11}\times\frac{11}{5}\right)\times\left(22\times\frac{5}{22}\right)\)

\(=1\times5\)

\(=5\)

5

Ta có: (x + 2)2 – 4 ≥ (x + 3)(x + 5) – x

⇔ x2 + 4x + 4 – 4 ≥ x2 + 5x + 3x + 15 – x

⇔ –3x ≥ 15 ⇔ x ≤ –5

Tập nghiệm: S = {x | x ≤ –5}.

a: \(=\dfrac{3}{5}:\dfrac{7}{5}=\dfrac{3}{5}\cdot\dfrac{5}{7}=\dfrac{3}{7}\)

b: \(=\dfrac{9}{17}\left(\dfrac{8}{5}-\dfrac{3}{5}\right)+\dfrac{8}{17}\)

=9/17+8/17=1

c: =>x-3/10=7/15*1/5=7/75

=>x=7/75+3/10=59/150

(2/3x3/2) x10/21= 1 x10/21 =10/21

22/5x5/22 x12 = 1x12 =12

2/3 x 10/21 x3/2 = 10/21.

22/5 x 12 x 5/22 = 12.

ban biet lam thi giai ra cho minh di

1, =4/9 x (3/7 + 2 x 4/7) - 1/9 - 3/9

= 4/9 x 1 - 1/9 - 3/9 = 0

2, = ( 22/5 x 5/22 ) x 12

= 1 x 12 = 12

thằng duc bị ngu à 

dễ còn hơn cả ăn bánh

a, \(\frac{2}{3}\)x \(\frac{10}{21}\)x \(\frac{3}{2}\)= \(\frac{2x10x3}{3x21x2}\) = \(\frac{10}{21}\)

b, \(\frac{22}{5}\)x \(12\)x\(\frac{5}{22}\) = \(\frac{22x12x5}{5x22}\) = \(12\)

a = 10/21

b = 12

kết bạn mk nha. và tk nữa. thanks

a 10/21

b 12

a. \(x-\dfrac{3}{2}=\dfrac{5}{6}\)

\(x=\dfrac{5}{6}+\dfrac{3}{2}\)

\(x=\dfrac{14}{6}=\dfrac{7}{3}\)

b. \(\dfrac{2}{5}\) x \(x=\dfrac{2}{3}\)

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

\(x=\dfrac{2}{3}\) x \(\dfrac{5}{2}\)

\(x=\dfrac{5}{3}\)

`x - 3 / 2 = 5 / 6`

`x = 5 / 6 + 3 / 2`

`x = 5 / 6 + 9 / 6`

`x = 14 / 6 = 7 / 3`    Vậy `x = 7 / 3`

_______________________________

`2 / 5 xx x = 2 / 3`

`x = 2 / 3 : 2 / 5`

`x = 2 / 3 . 5 / 2`

`x = 5 / 3`            Vậy `x = 5 / 3`

______________________________

`2 / 5 : x = 1 / 3`

`x = 2 / 5 : 1 / 3`

`x = 2 / 5 . 3`

`x= 6 / 5`            Vậy `x = 6 / 5`

_______________________________

`x : 5 / 11 = 22`

`x = 22 . 5 / 11`

`x = 10`                 Vậy ` x = 10`