... ợ0 ,25 2. (1im) - Vậy d : 2 2 2 3 3 31 2 1x y z - - - = = -0 ,25 PT (z-1)(z+3)(z +2) z=10 (z 2 +2z-3)( z 2 +2z)=100 ,25 2 2 2 5 2 2z zz z ộ + = ờ + = - ở0 ,25 CõuVIIA(1) { }1 ... tx= 2 1THScútimcnnganglty =2 0 ,25 c)Bngbinthiờn:x Ơ 1+Ơy + +y +Ơ 2 2Ơ0 ,25 CõuI(2im)*)th:thct 0yti(01)thcttrc0xti( 2 10)thnhngiao im2timcnI( 12) lmtõmixng.0 ,25 0 ,25 2.(0,75) 2. Nếu)(11 2 00CxxM ... = ị0 ,25 Tngt:0 1 24 yxyBB - =0 ,25 PTtABl:ABAABAxxxxyyyy - - = - -ThayyA,yBtac:y)( 4 1 24 00AAxxyyx - = -0 ,25 CõuVIA(2im)ThaytoimEv ptABtac: )4( 4 1 24 100AAxyyx...