x-2,5= 19,6+ 7,81

x-2,5= 27,41

x= 27,41+ 2,5

x=29,91

(x - 2,5 ) - 7,81 = 19,6

x - 2,5    = 19,6 + 7,81

x - 2,5    = 27,41

x            = 27,41 + 2,5

x            =  29,91

( x - 2,5 ) - 7,81 = 19,6

( x - 2,5 )            = 19,6 + 7,81

( x - 2,5 )            = 27,41

 x                         = 27,41 + 2,5

 x                         = 29,91

    Vậy x = 29,91 

be beautiful sights in the village when I lived here. 
be many old buildings 10 years ago. 
was built here. 
owned this wardrobe since my wedding day. 
been seen for 2 years.

\(x^3-x^2y+3x-3y\)

\(=x^2\left(x-y\right)+3\left(x-y\right)\)

\(=\left(x-y\right)\left(x^2+3\right)\)

\(=x^2\left(x-y\right)+3\left(x-y\right)=\left(x^2+3\right)\left(x-y\right)\)

\(x^3-x^2y+3x-3y=x^2\left(x-y\right)+3\left(x-y\right)=\left(x-y\right)\left(x^2+3\right)\)

Chụp thiếu đề em ơi !