... tip imA,BlA(x A ,y A ),B(xB,yB)PTttMAl:(x A 4) (x4)+y A y =4 Vỡtt iquaM(0y0)nờntac 4( x A 4) +y A y0 =4 01 24 yxy A A - = ị0,25Tngt:01 24 yxyBB - =0,25PTtABl:AB A AB A xxxxyyyy ... =0,25PTtABl:AB A AB A xxxxyyyy - - = - - Thayy A ,yBtac:y)( 4 1 24 00 A Axxyyx - = - 0,25CõuVIA(2im)ThaytoimEv ptABtac: )4( 4 1 24 100 A Axyyx - = - - 4 0 = yVycú1imt/mM( 04) 0,25 2. - Phơng ... ^HaySIlàđườngcaoc a hchópS.ABMN0,25CâuIV(1điểm)TgSEFđềucạnh a, IlàtrđSFnênSI =a/ 2Vậy:V=3216321.833.31 a a a =0,25 Theo B§T Cauchy ta cã: 4 4 4 333 3 33 3 372167 7 7 a a a b a b b b + + + + ³ + + + (1) 4 4 4 333 3 33 3 372167...