B
butchi1234


cho hinh chop SABCD co day la hinh binh hanh ABCD. lay M tren SC sao cho SM=2SC. goi (P) la mat phang chua AM va song song voi BD. goi B' , D' la giao diem cua (P) voi SB,SD . tinh ti so dien tich tam giac SB'D' va tam giac SBD
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