Question

Tìm x

a, x- \(\dfrac{5}{6}\)= \(\dfrac{16}{42}\)+ \(\dfrac{-8}{56}\)

b, x + \(\dfrac{7}{8}\)=\(\dfrac{13}{12}\)

c, \(\dfrac{x}{15}\)=\(\dfrac{19}{15}\)

d, x + \(\dfrac{4}{5}\)= \(\dfrac{6}{20}\)-\(\dfrac{-7}{3}\)

e,-\(\dfrac{-7}{5}\)- x = \(\dfrac{-4}{9}\)

Answer 1

`x-5/6 = 16/42 + (-8)/56`

`x-5/6=8/21 - 1/7`

`x-5/6 = 8/21 - 3/21`

`x-5/6=5/21`

`x=5/21+5/6`

`x=15/14`

______________________

`x+7/8=13/12`

`x=13/12-7/8`

`x=26/24-21/24`

`x=(26-21)/24`

`x=5/24`

_______________________

`x/15 = 19/15`

`x=19/15 xx 15`

`x=(19xx15)/15`

`x=19`

_________________

`x+4/5=6/20-(-7/3)`

`x+4/5=6/20+7/3`

`x+4/5=79/30`

`x=79/30-4/5`

`x=79/30 - 24/30`

`x=11/6`

______________________

`-7/5-x=-4/9`

`x=-7/5-(-4/9)`

`x=-7/5+4/9`

`x=-63/45+ 20/45`

`x=-43/45`