... ((PQCD) ị SPQCDPQCDaaVSSHa23. 115 1425105 3392714=== Ã Cú th dựng cụng thc t s th tớch: SPQCSPQCSABCSABCSPCDSPCDSACDSACDVSPSQVVaVSASBVSPVVaVSA.3 .3. .22445 ... xtytzt376ỡ=+ù=+ớù =- ợ. Cõu VII .a: aizziaiai222121421ộ =- + =-= - ờ =-+ ở. 2. Theo chng trỡnh nõng cao Cõu VI.b: 1) (C): xyxy226250+ += ị Tõm I(3; 1), bỏn kớnh R = 5. Gi s (D): axbycc0(0)++=ạ. ... dId(,)52cos(,)2DDỡ=ùớ=ùợ ị abcabc2,1,101,2,10ộ= =-= - ờ== =- ở ị xyxy:2100:2100DDộ =ờ +-= ở. 2) Ly B ẻ (d1), C ẻ (d2). T : ABkAC=uuuruuur ị k12= ị B l trung im ca on thng AC. Ta cú th...