Có : (a^3-3ab^2)^2 = 5^2 = 25
<=> a^6-6a^4b^2+9a^2b^2 = 25
(b^3-3a^2b)^2 = 10^1 = 100
<=> b^6-6a^2b^4+9a^4b^2 = 100
=> 5^3 = 125 = 25 + 100 = a^6-6a^4b^2+9a^2b^4+b^6-6a^2b^4+9a^4b^2 = a^6+b^6+3a^2b^4+3a^4b^2 = (a^2+b^2)^3
=> a^2+b^2 = 5
=> D = 312018.(a^2+b^2) = 312018 . 5 = 1560090
Tk mk nha
tk bn nha nhưng mà (a^3 - 3ab^2)^2 = a^6 - 9a^2b^4 mà bn