help me

L

langtu_92ht

7-4 can 3 = (2- can 3)^2
chia ca 2 ve cho ( 2- can 3)
cuoi cung ra : (2- can +3)^(x-1) + (2- can 3 )^ (x-1) = 4
de thay (2- can 3) = 1 : (2+ can 3)
sau do dat an phu la dc dung thi thanks minh nha
 
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