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nguyenvannhc
2 năm trước
Cho tứ giác lồi ABCD có AB=AC=AD=10cm góc B=60° và góc A là 90° a,tính BD b, kẻ DH vuông góc AC (H thuộc AC). DH=? c, vẽ BE vuông góc tia DC (E nằm trên tia đó). DE=?
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