Question

[Cao Xuân Hùng]

tìm m,n ?ϵ m*, biết : 2^m + 2ⁿ = 2^m+n

ta có : 

2^m + 2ⁿ = 2^m+n 

2^m + 2ⁿ = 2^......... 2^.........

2^......... 2^......... - 2^{m -} 2ⁿ = 0

( 2^......... 2^......... - 2^m )  ^- 2ⁿ = 0

2^m . ( ................. -.................) =1

( ........................- ........................) . ( ............................. - .................................) = 1