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L

luffy_95

ban tu ve hinh nhe!
ta co!
ST\bigcap_{}^{}(BCD)=ST\bigcap_{}^{}CD[thuoc mp (ACD)] ---> V=CD
mat khac theo TA-LET ta co RS//BD ---> (V,RS)=(V,BD)=(CD,BD)=[TEX]60^{o}[/TEX]
khong biet dung khong?!!
 
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