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nguyennhuthanh
2 năm trước
Các đường chéo của một tứ giác chia tứ giác đó thành bốn tam giác, trong đó 3 tam giác có diện tích bằng 30 cm ², 60 cm ², 90 cm ². Tính diện tích tứ giác đó/
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