Toán Lớp 6: cho doan thang AB co do dai 9 cm .diem C thuoc doan thang AB sao cho AC=3cm .goi D la trung tam cua doan thang CB .So sanh AC vaDB
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Toán Lớp 6: cho doan thang AB co do dai 9 cm .diem C thuoc doan thang AB sao cho AC=3cm .goi D la trung tam cua doan thang CB .So sanh AC vaDB
Comments ( 1 )
Mà AB=AC+BC
=> BC=6cm
Lại có D là trung tâm CB=> DB=6:2=3cm
=> DB=AC=3cm
Xin hay nhất