Question

tìm x thuộc N:16^x<128^4

 

Answer 1

 a/16^x < 128^4 
=> (4^2)^x < 128^4 
=> 4^2x < 128^4 
=> (2^2)^2x < 128^4 
=> 2^4x < (2^7)^4 
=> 2^4x < 2^28 
=> 4x < 28 
=> x < 7 
vậy x = {0,1,2,3,4,5,6}