Ta có : 2x + 2x + 2 = 160
=> 2x(1 + 22) = 160
=> 2x . 5 = 160
=> 2x = 32
=> 2x = 25
=> x = 5
2x + 2x + 2 = 160
Ta thấy : 160 = 26 + 25
\(\Rightarrow\)2x = 25 nên x = 5
\(\Rightarrow\)2x+2 = 26 nên x = 4
2x + 2x + 2 = 160
Ta có :
2x + 2x x 22 = 160
2x + 2x x 4 = 160
2x x 1 + 2x x 4 = 160
2x . ( 1 + 4 ) = 160
2x . 5 = 160
2x = 160 : 5
2x = 32
2x = 25
Vậy : x = 5