Mathematics, 22.07.2021 14:00, rayne40

có 26 viên bi đỏ và 124 viên bi xanh phải thêm và bớt số lương bi xanh và bi đỏ để có số lượng bi đỏ bằng 1/4 viên bi xanh

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có 26 viên bi đỏ và 124 viên bi xanh phải thêm và bớt số lương bi xanh và bi đỏ để có số lượng bi đỏ...