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2 năm trước
một bảng chỉ đường hình tròn có đường kính 50cm a. tính diện tích bảng chỉ đường bằng mét vuông. b. người ta sơn 2 mặt tấm bảng đó , mỗi mét vuông hết 70.000 đồng. hỏi sơn tấm bẳng đó hết bao niêu tiền
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