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thithu2018
2 năm trước
Một hình tam giác có cạnh đáy bằng 5/4 chiều cao .nếu kéo dài cạnh đáy thêm 5 cm thì diện tích hình tam giác đó tăng thêm 30 cm2 .Tính diện tích hình tam giác.
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