Bài 1 (2điểm): Tính.
a) 5/9 + 8/9 =................................................. b) 4/3 - 4/8 =.................................................
c) 14/9 x 2/3 =.............................................. d) 14/15 : 5/6 =...................................................
a)\(\frac{5}{9}+\frac{8}{9}=\frac{5+8}{9}=\frac{13}{9}\)
b)\(\frac{4}{3}-\frac{4}{8}=\frac{32}{24}-\frac{12}{24}=\frac{32-12}{24}=\frac{20}{24}=\frac{5}{6}\)
c)\(\frac{14}{9}\times\frac{2}{3}=\frac{14\times2}{9\times3}=\frac{28}{27}\)
\(\frac{14}{15}:\frac{5}{6}=\frac{14}{15}\times\frac{6}{5}=\frac{14\times6}{15\times5}=\frac{84}{75}=\frac{28}{25}\)