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hinh` thang ABCD can, day lon 30cm day' nho? CD 10cm va` A^=60 do .
a) tinh' canh. Bc
B) Goi. M,N lan` luot la` trung diem cua AB va` CD. Tinh MN
a) tinh' canh. Bc
B) Goi. M,N lan` luot la` trung diem cua AB va` CD. Tinh MN