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thaibaosp0709
2 năm trước
cho hình tam giác ABC có AB = 12 cm, AC = 15 cm. kéo dài AB về phía C lấy điểm M, N sao cho AM=AN = 20cm. nối M với N, biết diện tích ABC bằng 45cm2. tính diện tích hình tam giác AMN. làm theo ý của bạn nhá mình không bắt buộc.
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