\(a,\dfrac{5}{8}+\dfrac{3}{8}:\dfrac{2}{3}=\dfrac{5}{8}+\dfrac{3}{8}\times\dfrac{3}{2}=\dfrac{5}{8}+\dfrac{9}{16}=\dfrac{10}{16}+\dfrac{9}{16}=\dfrac{19}{16}\)
\(b,\dfrac{6}{5}-\dfrac{2}{3}:\dfrac{5}{2}=\dfrac{6}{5}-\dfrac{2}{3}\times\dfrac{2}{5}=\dfrac{6}{5}-\dfrac{4}{15}=\dfrac{18}{15}-\dfrac{4}{15}=\dfrac{14}{15}\)
\(c,6:\dfrac{5}{2}-\dfrac{3}{10}=6\times\dfrac{2}{5}-\dfrac{3}{10}=\dfrac{12}{5}-\dfrac{3}{10}=\dfrac{24}{10}-\dfrac{3}{10}=\dfrac{21}{10}\)
\(d,\dfrac{9}{5}+\dfrac{2}{5}\times\dfrac{4}{6}=\dfrac{9}{5}+\dfrac{4}{15}=\dfrac{27}{15}+\dfrac{4}{15}=\dfrac{31}{15}\)
a:=5/8+9/16=10/16+9/16=19/16
b: =6/5-4/15=18/15-4/15=14/15
c: =12/5-3/10=2,4-0,3=2,1
d: =9/5+8/30=62/30=31/15
`a)5/8 + 3/8 : 2/3= 5/8+3/8 xx 3/2= 5/8 +9/16= 10/16 + 9/16=19/16`
`b) 6/5 - 2/3 : 5/3=6/5 - 2/3 xx 2/5= 6/5- 4/15 = 18/15-4/15= 14/15`
`c) 6 : 5/2 - 3/10 = 6 xx 2/5 - 3/10= 12/5 - 3/10= 24/10-3/10=21/10`
`d) 9/5 + 2/5 xx 4/6=9/5+ 8/30 = 54/30 + 8/30 = 62/30= 31/15`