... 130 LờVnPhongTrnTrngNguyờn,HKTQD Chng3.Cỏcthamsctrngc abinngunhiờn 3 81).1). (3( 81) .3) .(2(82).2).(2(81) .3) .(1(82).2).(1(81).1).(0()(=+++++=XYE 2 3 =81 3+ 8 3 2+8 3 1+810= ... LêVănPhong‐TrầnTrọngNguyên,ĐHKTQD 134 33 133 =1= ,)XY(E c. Khi X= 2 Y 0 100 200 30 0 400 )xy(p 0 0 09600 32 0,,09600640,,0 67266=2= ,)XY(E d. Khi X= 3 Y 0 100 200 30 0 400 )xy(p 0 0 0 0 1 =400 =3) XY(E ... 111LờVnPhongTrnTrngNguyờn,HKTQD Chng3.Cỏcthamsctrngc abinngunhiờn+<<+=<4 3 4 3 4abXbaPab)X(EXP ++++==4ab34ba34ab34ba3xab1dxab1 21= Thí dụ 3: Cho X là một...