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phungthingoclinh25724
2 năm trước
Cho tam giác abc cân tai a, m, n,p là trung điểm ab,ac,bc. Cmr a, tứ giác mncb là hình gì b, mp đi qua trung điểm o ủa bn c, ampn là hình thoi d, tìm điều kiên tam giác abc để ampn là hình vuông? .mình đang cần gấp
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