8/15 = 1/5 + 1/3

8./15 = 1/5 + 1/3 

Cách 1 : \(\frac{8}{15}=\frac{5}{15}+\frac{3}{15}=\frac{1}{3}+\frac{1}{5}\)

Cách 2 : \(\frac{8}{15}=\frac{2}{15}+\frac{6}{15}=\frac{2}{15}+\frac{2}{5}\)

8/15 = 4/15 + 4/15 = 1/15 + 7/15

VD:8/15=1/3+1/5

8/15 = 1/3 + 1/5

       = 1/15 + 7/15

       = 4/15 + 4/15

7/15=1/15+2/5=2/15+1/3=1/5+4/15

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

C1:3/8+1/2

C2:1/8+1/2

\(\frac{5}{8}=\frac{1}{8}+\frac{1}{2}\)

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

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

 Học tốt !

\(\dfrac{7}{15}=\dfrac{8}{15}+\dfrac{-1}{15}\)

10/27: 1/27+7/27+2/27

13/12: 1/12+7/12+5/12

15/8:7/8+3/8+5/8

10/27 = 1/27+2/27+7/27

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

15/8 =  3/8+5/8+7/8

ko biết nữa tui gà lắm