16/21=1/3+3/7

       =1/4+43/84

       =1/7+13/21

13/14=1/2+3/7

        =1/3+25/42

        =1/4+19/28

        =1/7+10/21

16/21=1/3+3/7

=1/4+43/84

=1/7+13/21

13/14=1/2+3/7

=1/3+25/42

=1/4+19/28

=1/7+10/21

đúng 100 % nka

\(\frac{16}{21}=\frac{1}{7}+\frac{1}{3}+\frac{2}{7}=.......\)

\(\frac{13}{14}=\frac{1}{2}+\frac{1}{7}+\frac{2}{7}=.......\)

chúc em học tốt !!!!

16/21 = 5/21 + 3/7

13/14 = 3/14 + 9/14

\(\frac{16}{21}=\frac{1}{7}+\frac{13}{21}=\frac{1}{21}+\frac{5}{7}\)

\(\frac{13}{14}=\frac{5}{7}+\frac{3}{14}=\frac{1}{2}+\frac{3}{7}\)

= mi học như chó

16/21 = 1/21 + 5/7

13/14 = 1/14 + 6/7

16/21 = 4/24+7/21+5/21

13/14=1/14+5/14+1/2

nhớ ****

Bằng 71/42

 lớn đến bé : 60/81 ; 21/25 ; 19/29

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

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

 Học tốt !

\(\dfrac{14}{21}=\dfrac{14:7}{21:7}=\dfrac{2}{3}=\dfrac{1}{3}+\dfrac{1}{3}\)

\(\dfrac{15}{29}=\dfrac{1+14}{29}=\dfrac{1}{29}+\dfrac{14}{29}\)

\(\dfrac{9}{35}=\dfrac{1+8}{35}=\dfrac{1}{35}+\dfrac{8}{35}\)

\(\dfrac{16}{27}=\dfrac{2+14}{27}=\dfrac{2}{27}+\dfrac{14}{27}\)

thank