Question

Tính:

a) 2/9 + 5/6 × 4/7

b) 21/25 + 4/5 :8/6

c) 17/24 - 1/3 + 3/4

Answer 1

a) \(\frac{2}{9}+\frac{5}{6}\times\frac{4}{7}\)

\(=\frac{2}{9}+\frac{10}{21}\)

\(=\frac{44}{63}\)

b) \(\frac{21}{25}+\frac{4}{5}:\frac{8}{6}\)

\(=\frac{21}{25}+\frac{3}{5}\)

\(=\frac{36}{25}\)

c) \(\frac{17}{24}-\frac{1}{3}+\frac{3}{4}\)

\(=\frac{3}{8}+\frac{3}{4}\)

\(=\frac{9}{8}\)

Answer 2

a) \(\frac{2}{9}+\frac{5}{6}\times\frac{4}{7}=\frac{2}{9}+\frac{10}{21}=\frac{14}{63}+\frac{30}{63}=\frac{44}{63}\)

b) \(\frac{21}{25}+\frac{4}{5}\div\frac{8}{6}=\frac{21}{25}+\frac{4}{5}\times\frac{6}{8}=\frac{21}{25}+\frac{3}{5}=\frac{21}{25}+\frac{15}{25}=\frac{36}{25}\)

c) \(\frac{17}{24}-\frac{1}{3}+\frac{3}{4}=\frac{17}{24}-\frac{8}{24}+\frac{18}{24}=\frac{27}{24}=\frac{9}{8}\)