các phân số bé hơn 1, có mẫu số là 4 va tử số khác 0
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1 + 9 = 10
2 + 8 = 10
3 + 7 = 10
4 + 6 = 10
Có thể lập tất cả: 1/9 ; 2/8 ; 3/7 ; 4/6
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
Số lẻ bé nhất có 3 chữ số là 101.
Số lẻ liền sau của số lẻ bé nhất có 2 chữ số là 13.
Mẫu số của phân số là :
(101+13):2=57
Tử số của phân số là :
57-13=44
Vậy P/S cần tìm là 44/57
dễ mà, hiệu là 13. Tổng là 101 rồi ta làm như bài toán tổng hiệu
Mẫu số là:(101+13):2=57
Tử số là:101-57=44
Phân số đó là:44/57
1/4;2/4;3/4
-1/4;-2/4;-3/4
dễ quá à là 1/4, 2/4, 3/4