Question

[thang luong]

giúp mik -_-

Answer 1

[Nguyễn Vũ Minh Hiếu]

\(\frac{2}{3}\times\frac{4}{7}:\frac{1}{5}=\frac{2}{3}\times\frac{4}{7}\times5=\frac{2\times4\times5}{3\times7}=\frac{40}{21}\)

\(\frac{2}{5}+\frac{4}{5}:\frac{6}{5}=\frac{2}{5}+\frac{4}{5}\times\frac{5}{6}=\frac{2}{5}+\frac{2}{3}=\frac{6}{15}+\frac{10}{15}=\frac{16}{15}\)

\(\frac{7}{3}-\frac{2}{3}:\frac{1}{3}=\frac{7}{3}-\frac{2}{3}\times3=\frac{7}{3}-2=\frac{1}{3}\)

Answer 2

[Nguyễn Vũ Minh Hiếu]

\(\frac{2}{5}+\frac{2}{3}+\frac{3}{4}=\frac{12}{60}+\frac{40}{60}+\frac{45}{60}=\frac{12+40+45}{60}=\frac{97}{60}\)

\(\frac{1}{3}+\frac{5}{12}+\frac{5}{6}=\frac{4}{12}+\frac{5}{12}+\frac{10}{12}=\frac{19}{12}\)

\(\frac{1}{6}+\frac{5}{24}+\frac{2}{3}=\frac{4}{24}+\frac{5}{24}+\frac{16}{24}=\frac{4+5+16}{24}=\frac{25}{24}\)