\(a,\dfrac{7}{15}=\dfrac{2}{15}+\dfrac{1}{3}\\ b,\dfrac{13}{27}=\dfrac{10}{27}+\dfrac{1}{9}\\ c,\dfrac{3}{18}=\dfrac{1}{18}+\dfrac{1}{9}\\ d,=\dfrac{1}{20}+\dfrac{1}{20}\)

Hi:D

a) 7 / 15 = 1 / 15 + 6 / 15

b) 13/27=11 / 27 + 2 / 27

c) 3 /18 = 1 / 9 + 1 / 18

bn lm dr^-^

a, 18/54 = 1/3 

b, 1/3 = 1/5 +2/15

a) \(\frac{18}{54}=\frac{1}{3}\)

b) \(\frac{18}{54}=\frac{1}{5}+\frac{2}{15}\)

~Học tốt~

$\frac{\mathrm{13/}}{12}=\frac{6}{\mathrm{/12}}+\frac{\mathrm{4/}}{12}+\frac{\mathrm{3/}}{12}=\frac{1}{\mathrm{/2}}+\frac{1}{\mathrm{/3}}+\frac{1}{\mathrm{/4}}$

ok

13/12=1/2+1/3+1/4

71/42

sai không đúng đầu bài

Ta có: 13/12 = 1/12 + 6/12 + 6/12 = 1/12 + 1/2  + 1/2

Còn Cái Nịt

a) 7 / 15 = 1 / 15 + 6 / 15

b) 13/27=11 / 27 + 2 / 27

c) 3 /18 = 1 / 9 + 1 / 18

d) 1 / 10 =  3/ 50 + 1 / 25

k mình nha!

a, \(\frac{1}{5}+\frac{4}{15}\)

b, \(\frac{2}{9}+\frac{7}{27}\)

c, \(\frac{1}{18}+\frac{1}{9}\)

d, \(\frac{1}{30}+\frac{1}{15}\)

5/12 + 7/12 + 1/12 = 13/12 . tick đúng nhé

\(\frac{13}{12}=\frac{1}{12}+\frac{5}{12}+\frac{7}{12}\)

5/12+7/12+1/12=13/12

tick nha ban

\(\frac{13}{15}\) = \(\frac{1}{5}\) + \(\frac{2}{3}\) = \(\frac{2}{5}\) + \(\frac{7}{15}\) = \(\frac{1}{3}\) + \(\frac{8}{15}\) 

 \(\frac{23}{20}\) = \(\frac{9}{10}\) + \(\frac{1}{4}\) = \(\frac{1}{2}\) + \(\frac{13}{20}\) = \(\frac{1}{5}\) + \(\frac{19}{20}\) = \(\frac{3}{10}\) + \(\frac{17}{20}\) = ....

 Học tốt !