Viết các phân số sau đây thành tổng ba phân số có tử số là 1 và mẫu số là số khác nhau A 13/35 B 17/63
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HT
8 tháng 8 2017
\(\frac{7}{8}=\frac{1}{8}+\frac{2}{8}+\frac{4}{8}=\frac{1}{8}+\frac{1}{4}\)\(+\frac{1}{2}\)
CC
3
23 tháng 2 2016
Ta có:\(\frac{7}{8}=\frac{1}{8}+\frac{2}{8}+\frac{4}{8}=\frac{1}{8}+\frac{1}{4}+\frac{1}{2}\)
Vậy \(\frac{7}{8}=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}\)
NL
0
21 tháng 7 2017
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
13/35=1/5+1/7+1/35 17/63=1/7+1/9+1/63
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