* Bạn tham khảo nha >v< *
$42 - 3|y - 3| = 4( 2012 - x )^4$
$42 - 3|y - 3| ≤ 42$
$⇒ 4( 2012 - x )^4 ≤ 42$
$⇒ 0 ≤ 4( 2012 - x )^4 ≤ 42$
$\textit{Thấy}$ $4( 2012-x)^4$ $\vdots$ $4$
$⇒ 4(2012-x)^4 ∈ \{ 0; 4; 8; 12; 16; 20; 24; 28; 32; 36; 40 \}$
$⇒ 4(2012-x)^4 = \{ 0; 4; 8; 12; 16; 20; 24; 28; 32; 36; 40 \}$
$⇒ 42 - 3|y - 3| = \{ 0; 4; 8; 12; 16; 20; 24; 28; 32; 36; 40 \}$
$\textit{Xét thấy:}$ $4(2012-x)^4 = 0$
$⇒ x = 2012$
$42 - 3|y - 3| = 0$
$⇒ y = 17$
