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Một khối đồ chơi gồm một khối nón và một khối trụ có cùng bán kính được chồng lên nhau, độ dài đường sinh của khối trụ bằng độ dài đường sinh khối nón và bằng đường kính của khối trụ, [r]
Đề thi thử môn Toán THPT Thanh Chuong 1 - Nghe An lan 2 - 2019 - [blogtoanhoc.com]
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