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Phân tích:
15/16= 1/16+ 2/16 + 4/16 + 8/16= 1/16+1/8+1/4+1/2
Vậy: 15/16= 1/16+1/8+1/4+1/2
vì 16 chia hết cho 1, 2,4,8 nên ta có thể phs như sau:
\(\frac{15}{16}=\frac{1+2+4+8}{16}=\frac{1}{16}+\frac{2}{16}+\frac{4}{16}+\frac{8}{16}=\frac{1}{16}+\frac{1}{8}+\frac{1}{4}+\frac{1}{2}\)\( +\frac{1}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
31/32 = 1/32 + 30/32 = 1/32+15/16 = 1/32 +1/16+14/16 =>
31/32 = 1/32+1/16+7/8 = 1/32+1/16 +1/8+6/8 =>
31/32=1/32+1/16 +1/8+3/4 = 1/32+1/16+1/8+1/4+2/4 = 1/32+1/16+1/8+1/4+1/2
Vậy 31/32 = 1/32+1/16+1/8+1/4+1/2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1+\frac{1}{2}\)
\(\text{Hoặc : }\frac{20}{20}+\frac{1}{20}\)
\(\text{k tui }\)
![](https://rs.olm.vn/images/avt/0.png?1311)
31/32 = 1/32 + 30/32 = 1/32+15/16 = 1/32 +1/16+14/16 =>
31/32 = 1/32+1/16+7/8 = 1/32+1/16 +1/8+6/8 =>
31/32=1/32+1/16 +1/8+3/4 = 1/32+1/16+1/8+1/4+2/4 = 1/32+1/16+1/8+1/4+1/2
Vậy 31/32 = 1/32+1/16+1/8+1/4+1/2
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: 11/12 = 1/12 + 4/12 + 6/12
11/12 = 1/12 + 1/3 + 1/2
Có thể sẽ còn nhiều cách khác nhưng tớ chỉ cho cậu cách này thôi
\(\frac{15}{56}=\frac{7}{56}+\frac{8}{56}=\frac{1}{7}+\frac{1}{8}\)
2 phân số có tử số là 1