\(7,75-\left(0,5.x:5:6,2\right)=5\)

                  \(\left(0,5x:5:6,2\right)=7,75-5\)

               \(\left(0,5.x:6,2\right)=2,75\)

                         \(x:6,2=2,75:0,5\) 

                         \(x:6,2=5,5\)

                         \(x\)     \(=5,5.6,2\)

                         \(x\)       \(=34,1\)

a) -2/3+3/4+1/6-2/5

=-40/60+45/60+10/60-24/60

=-9/60

=-3/20

b) -2/3-1/5+3/4-5/6+1/10

=-40/60-12/60+45/60-50/60+6/60

=-51/60

=-17/20

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

`-> 1/x = 5/6 - y/3`

`-> 1/x = 5/6 - ( 2y ) / 6`

`-> 1/x = ( 5 - 2y ) / 6`

`-> x ( 5 - 2y ) = 6`

e gõ latex hoặc vt r chụp lên nhé như vầy ko nhìn đc cái đề nx e

a) \(2\dfrac{3}{4}-\left(\dfrac{1}{7}+1\dfrac{3}{4}\right)\)

\(=\dfrac{11}{4}-\dfrac{1}{7}-\dfrac{7}{4}=\left(\dfrac{11}{4}-\dfrac{7}{4}\right)-\dfrac{1}{7}=1-\dfrac{1}{7}=\dfrac{6}{7}\)

b) \(\dfrac{7}{-25}+\dfrac{-18}{25}+\dfrac{4}{23}+\dfrac{5}{7}+\dfrac{19}{23}\)

\(=\left(\dfrac{-7}{25}+\dfrac{-18}{25}\right)+\left(\dfrac{4}{23}+\dfrac{19}{23}\right)+\dfrac{5}{7}=-1+1+\dfrac{5}{7}=\dfrac{5}{7}\)

c) \(\dfrac{-1}{4}\left(12\dfrac{3}{4}-7,75\right)-25\%.3\dfrac{1}{2}\)

\(=\dfrac{-1}{4}\left(12\dfrac{3}{4}-7\dfrac{3}{4}\right)-\dfrac{1}{4}.\dfrac{7}{2}=\dfrac{-1}{4}.5-\dfrac{7}{8}\\ =-\dfrac{5}{4}-\dfrac{7}{8}=-\dfrac{17}{8}\)

a: \(=\dfrac{5}{4}\cdot\dfrac{2}{5}\cdot\dfrac{17}{21}\cdot\dfrac{7}{34}=\dfrac{1}{2}\cdot\dfrac{1}{2}\cdot\dfrac{1}{3}=\dfrac{1}{12}\)

b: =>0,5^x(0,5+1)=1,5

=>0,5^x=1

=>x=0

c: =>x*0,05-0,25*x=-1,2

=>-0,3*x=-1,2

=>x=4

d: =>x-1=1 hoặc x-1=-1

=>x=0 hoặc x=2

e: =5+4=9

125% : \(x\) + 234 = 7,75

125% : \(x\)           = 7,75 - 234

125% : \(x\)           = - 226,25

             \(x\)          = 125% : (- 226,25)

              \(x\)         = - \(\dfrac{1}{181}\)

125% : x + 234 = 7,75

\(\dfrac{5}{4}\) : x + 234 = 7,75

\(\dfrac{5}{4}\) : x = 7,75 - 234

\(\dfrac{5}{4}\) : x = -226,25

          x = \(\dfrac{5}{4}\) : (-226,25)

          x = \(\dfrac{1}{181}\)

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