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thanhphuoc2004
2 năm trước
1, cho hình thang vuông ABCD ( xem hình vẽ) có diện tích bằng 90 cm2. AB = 1/2 CD. Tính diện tích tam giác ABD. 2, cho hình bên với ABCD là hình chữ nhật có diện tích bằng 6m2. Tính diện tích tam giác DEC.
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