a) ( 5x - 2 )2 = 64
( 5x - 2 )2 = 82
\(\Rightarrow\)5x - 2 = 8
5x = 10
x = 2
b) 25x+1 = 64
25x + 1 = 26
\(\Rightarrow\)5x + 1 = 6
5x = 5
x = 1
Hk tốt
a) ( 5x - 2 )2 = 64
( 5x - 2)2 = 82
5x - 2 = 8
5x = 10
x = 10 : 5 = 2
b) 25x + 1 = 64
25x+1 = 26
5x + 1 = 6
5x = 5
x = 5 : 5 = 1