Question

tìm x biết :

x + 12 - \(\sqrt{81}\)= 81

Answer 1

\(x+12-\sqrt{81}\)\(=81\)

\(x+12-9=81\)

\(x+3=81\)

\(x=81-3\)

\(x=78\)

Vậy \(x=78\)

Answer 2

X+12-√81=81

=|x+12-9-81=0

=|x-78=0

=|x=78

Answer 3

x + 12 - \(\sqrt{81}\) = 81 . 

x + 12 - 9 = 81 . 

x = 81 + 9 - 12 . 

x = 78 . 

Answer 4

\(x+12-\sqrt{81}=81\)

<=> \(x+12-9=81\)

<=> \(x=78\)