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princessbexinh


Cho tam giac ABC va tam giac A'B'C' co AB=A'B', AC=A'C' va goc A va goc A' bu nhau. Goi M la trung diem cua BC, tren tia AM lay diem D sao cho MD= MA
a. CM: goc ABD= goc A'
b. CM: AM=1/2B'C'







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a. CM: goc ABD= goc A'
b. CM: AM=1/2B'C'
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