[SỐ HỌC 6] TOÁN NÂNG CAO (001)

Nếu ta lấy tổng của tất cả các chữ số của một số tự nhiên có hai chữ số nhân với 5 thì kết quả nhận được lớn hơn số đã cho 1 đơn vị. Tìm số tự nhiên có hai chữ số đó.

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