Cho hc SABCD co day la hinh thoi tam O, SBD deu canh 2a , SAC vuong tai S , SC=a căn3 , goc giua (SBD) va mat day la 60 độ. tinh V va d(AC, SB) 
   (Mong moi nguoi giup e , neu duoc xin ve hinh lun ạ, xin cam on )
thuc ra neu can gap thi co the giai nhung nhap cong thuc rat lau nen mjnh nghi moi nguoi chi nen dua ra huong giai de tu suy nghi trinh bay thi ban se hieu ro hon –  thiensugacoi_95 02-05-13 07:53 PM
vay mong ban dua ra huong giai cung duoc , thanks trc nha :)

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