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Mathematics, 25.10.2021 19:10 Molly05
số bi của bình bằng 1/2 số bi của trung, biết trung bớt đi 9 viên thì trung còn lại 49 viên. tính số bi của bình
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số bi của bình bằng 1/2 số bi của trung, biết trung bớt đi 9 viên thì trung còn lại 49 viên. tính số...
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