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tyrfing
2 năm trước
cho tam giác abc vuông tại a nếu giữ nguyên cạnh ab kéo dài đoạn AC 1 đoạn CM = 5cm thì diện tích tam giác tăng thêm 125 cm2 . Nếu giữ nguyên cạnh AC, bớt cạnh AB đi 1 đoạn BN=4cm thì diện tích tam giác giảm đi 70m2 . Tính diện tích tam giác ABC
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