(7.x-11)3 = 25 . 52 + 200
(7x-11)3=103
=> 7x - 11 = 10
=> 7x = 21
=> x = 3
tính vế kia trc
25 . 52 + 200 = 32 . 25 + 200 = 1000
=> ( 7x - 11 )3 = 1000
Mà: 103 = 1000
=> 7x - 11 = 10
7x = 21
x = 3
(7.x-11)3 = 25 . 52 + 200
(7.x-11)3 = 32 . 25 + 200
(7.x-11)3 = 800 + 200
(7.x-11)3 = 1000
(7.x-11)3 = 103
7.x-11=10
7x=10+11
7x=21
x=21:7
x=3