Viết phân số lớn nhất có tổng tử số và mẫu số là 2006.
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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
\(\frac{7}{8}=\frac{1}{8}+\frac{2}{8}+\frac{4}{8}=\frac{1}{8}+\frac{1}{4}\)\(+\frac{1}{2}\)
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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
Ta có:\(\frac{7}{8}=\frac{1}{8}+\frac{2}{8}+\frac{4}{8}=\frac{1}{8}+\frac{1}{4}+\frac{1}{2}\)
Vậy \(\frac{7}{8}=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}\)