Cho số 1978. Số này sẽ thay đổi nếu: a) Viết thêm chữ số 0 vào bên phải số đó? ................................................................................ b) Viết thêm chữ số 4 bên phải số đó? ....................................................................... c) Đổi chỗ chữ số 1 và chữ số 8 cho nhau? ................................................................................. d) Xóa đi chữ số 8? ...........................................................................

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