\(\dfrac{13}{35}=\dfrac{1}{7}+\dfrac{1}{5}+\dfrac{1}{35}\)

\(\dfrac{13}{35}=\dfrac{1}{5}+\dfrac{1}{7}+\dfrac{1}{35}\)

\(\frac{13}{36}=\frac{1+3+9}{36}=\frac{1}{36}+\frac{1}{12}+\frac{1}{4}\)\(\frac{13}{36}=\frac{1+3+9}{36}=\frac{1}{36}+\frac{1}{12}+\frac{1}{4}\)

13/36 = 1/9 + 1/4

\(\frac{13}{16}=\frac{1}{2}+\frac{1}{4}+\frac{1}{16}\)

Ta có:\(\frac{13}{16}=\frac{1+4+8}{16}=\frac{1}{16}+\frac{1}{4}+\frac{1}{2}\)

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a: 13/35=1/5+1/7+1/35

b:17/6=1/2+1/3+2

Bài 2:

\(\frac{13}{36}=\frac{1+5+7}{36}=\frac{1}{36}+\frac{5}{36}+\frac{7}{36}\)

\(\frac{31}{60}=\frac{1+23+7}{60}=\frac{1}{60}+\frac{23}{60}+\frac{7}{60}\)

Bài 1:

\(\frac{25}{27}=\frac{1+3+9+3+9}{27}=\frac{1}{27}+\frac19+\frac13+\frac19+\frac13\)

\(\frac{15}{16}=\frac{8+7}{16}=\frac12+\frac{7}{16}=\frac12+\frac{4+3}{16}=\frac12+\frac14+\frac{3}{16}\)

\(=\frac12+\frac14+\frac{2+1}{16}=\frac12+\frac14+\frac18+\frac{1}{16}\)

\(\dfrac{17}{20}=\dfrac{10+5+2}{20}\)

\(=\dfrac{10}{20}+\dfrac{5}{20}+\dfrac{2}{20}=\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{10}\)

\(\dfrac{7}{8}=-\dfrac{1}{8}+1\)

7/8=1/2+ 1/4+1/8