Khi trừ 4012 đi một số tự nhiên có ba chữ số, do sơ suất, một học sinh đã đặt phép tính như sau:
Vì vậy kết quả của phép tính đã tăng thêm 2981 đơn vị. Tìm kết quả đúng.

Phương pháp giải

- Theo cách đặt tính thì học sinh đó đã cộng 4012 với 10 lần số abc. - Tìm xem 2981 gấp abc bao nhiêu lần - Tìm abc - Tìm hiệu đúng

Lời giải của GV ufaindo.xyz

Theo cách đặt tính thì học sinh đó đã cộng 4012 với 10 lần số abc. Vậy 2981 gấp abc số lần là: 10 + 1 = 11 (lần) Số có ba chữ số đó là: 2981 : 11 = 271 Kết quả đúng của phép tính đó là: 4012 – 271 = 3741 Đáp số: 3741

Báo lỗi - Góp ý

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Khi trừ 4012 đi một số tự nhiên có ba chữ số, do sơ suất, một học sinh đã đặt phép tính như sau: Vì vậy kết quả của phép tính đã tăng thêm 2981 đơn vị. Tìm kết quả đúng.

Khi trừ 4012 đi một số tự nhiên có ba chữ số, do sơ suất, một học sinh đã đặt phép tính như sau:
Vì vậy kết quả của phép tính đã tăng thêm 2981 đơn vị. Tìm kết quả đúng.