Cho tam giác ABC. Nếu kéo dài đáy BC thêm 7,2cm thì diện tích tam giác tăng thêm 45cm2. Nếu giảm chiều cao 7,2cm thì diện tích hình tam giác bị giảm 50,4cm2. Tính diện tích tam giác ABC.

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