Đề 5 − + ( ) ( ) ! " " !A = − + #$%&'()*)+" ,-./ 0$%&1( 2 0 .$%&.3 "4567892 " x y x y + = − = :892* )*)"(! ;6* * <=( * " * +* " * + >?7@A7/B ;!8C/BA781A7 ; D!8C/BE751EE/F'3G/F'751EE? 3H2IJ0<%&/F'3/BKL M<N3O%&/F'3 KL M#7@9!/F'3I$%&3EG/F'K$O < <# PNIQRP8C #PS< I PN3 P( <S( " < D<#T8C@U8C1PNV,-37'3 P*N'IW8C@U<XY'ZET8C@[ZI-37 '3IW8C@ \P*R] \N'R< UP]Z?378^ 8C@< _&P \N]R`<Z`%#%#IWP]< . Đề 5 − + ( ) ( ) ! ". ;6* * <=( * " * +* " * + >?7@A7/B ;!8C/BA781A7 ; D!8C/BE7 5 1EE/F'3G/F'7 5 1EE? 3H2IJ0<%&/F'3/BKL M<N3O%&/F'3 KL. 0$%&1( 2 0 .$%&.3 "4 5 67892 " x y x y + = − = :892* )*)"(!