` 5/8 -x = 7/6`

`=> x= 5/8 -7/6`

`=>x= 30/48 - 56/48`

`=>x=-26/48`

`=>x=-13/24`

__

`1/6 + 1/5 :x =-7 /18`

`=>  1/5 :x =-7 /18 -1/6`

`=>  1/5 :x =-7 /18- 3/18`

`=>  1/5 :x =-5/9`

`=>x= 1/5 : (-5/9)`

`=>x= 1/5 xx (-9/5)`

`=>x=-9/25`

a: x=5/8-7/6=15/24-28/24=-13/24

b: =>1/5:x=-7/18-1/6=-7/18-3/18=-10/18=-5/9

=>x=-1/5:5/9=-9/25

\(\dfrac{5}{8}-x=\dfrac{7}{6}\\ x=\dfrac{5}{8}-\dfrac{7}{6}\\ x=\dfrac{15}{24}-\dfrac{28}{24}\\ x=-\dfrac{7}{24}\)

\(\dfrac{1}{6}+\dfrac{1}{5}:x=-\dfrac{7}{18}\\ \dfrac{1}{5}:x=-\dfrac{7}{18}-\dfrac{1}{6}\\ \dfrac{1}{5}:x=-\dfrac{7}{18}-\dfrac{3}{18}\\ \dfrac{1}{5}:x=-\dfrac{5}{9}\\ x=\dfrac{1}{5}:\left(-\dfrac{5}{9}\right)\\ x=-\dfrac{9}{25}\)

X + X x \(\dfrac{1}{3}\) + \(\dfrac{5}{18}\) = \(\dfrac{7}{6}\)

X x \(\dfrac{4}{3}\)                 = \(\dfrac{7}{6}-\dfrac{5}{18}\)

X x \(\dfrac{4}{3}\)                 = \(\dfrac{8}{9}\)

X                        = \(\dfrac{8}{9}:\dfrac{4}{3}=\dfrac{2}{3}\)                  

\(x\cdot\left(\dfrac{1}{3}+1\right)=\dfrac{21}{18}-\dfrac{5}{18}=\dfrac{16}{18}=\dfrac{8}{9}\)

\(x=\dfrac{8}{9}:\dfrac{4}{3}=\dfrac{8}{9}\cdot\dfrac{3}{4}=\dfrac{4\cdot2\cdot3}{3\cdot3\cdot4}=\dfrac{2}{3}\)

\(\frac{1.5.18+2.10.36+3.15.54}{1.3.9+2.6.18+3.9.27}=\frac{1.5.18.\left(1+2.2.2+3.3.3\right)}{1.3.9.\left(1+2.2.2+3.3.3\right)}\)

\(=\frac{1.5.18}{1.3.9}=\frac{10}{3}\)

\(\frac{5}{6}-\left(x+\frac{1}{18}\right)=0\)

\(\frac{5}{6}-x=\frac{1}{18}\)

\(x=\frac{5}{6}-\frac{1}{18}\)

\(x=\frac{7}{9}\)

\(\frac{5}{6}\)- (x+\(\frac{1}{18}\)) =0

  \(\frac{5}{6}\)-x              =0

            x              =\(\frac{5}{6}\)-0 

             x             =\(\frac{5}{6}\)- \(\frac{1}{18}\)

             x               =\(\frac{14}{18}\)= \(\frac{7}{9}\)

            cậu học lớp 4D phải không

Tìm x,biết :1/6+ -5/7:x= - 7/18

=> -5/7 : x = -7/18 - 1/6

=> -5/7 : x = -5/9

=> x = -5/9 : -5/7 = 7/9

18.(-7)+2.(-7)

\(\dfrac{3}{2}+\dfrac{-1}{3}< \dfrac{x}{6}< \dfrac{1}{9}+\dfrac{31}{18}\)

\(\dfrac{7}{6}< \dfrac{x}{6}< \dfrac{11}{6}\)

\(=>x=8,9,10\)

1: =>x/5=6/5

=>x=6

2: =>x^2=36

=>x=6 hoặc x=-6

3: =>x-5/2=3+1/6=19/6

=>x=19/6+5/2=19/6+15/6=34/6=17/3

4: =>x=1/2:2/5=1/2*5/2=5/4