(7x - 11)3 = 25.52 + 200
(7x - 11)3 = 1000
(7x - 11)3 = 103
7x - 11= 10
7x = 21
x = 3
Vậy x = 3
( 7x - 11 )3 = 25 . 52 + 200
( 7x - 11 )3 = 32 . 25 + 200
( 7x - 11)3 = 800 + 200
( 7x - 11 )3 = 1000
( 7x - 11 )3 = 103
\(\Rightarrow\) 7x - 11 = 10
\(\Rightarrow\) 7x = 21
\(\Rightarrow\) x = 3
Vậy x = 3