Phần nguyên của hỗn số 4/2/7 là?

Bài 1:

\(a.\ \frac{5}{6}+3\frac{4}{9}=\frac{5}{6}+\frac{31}{9}=\frac{15}{18}+\frac{62}{18}=\frac{77}{18}\)

\(b.\ 5\frac{4}{7}-\frac{2}{3}=\frac{39}{7}-\frac{2}{3}=\frac{107}{21}-\frac{14}{21}=\frac{93}{21}=\frac{31}{7}\)

Bài 2:

a) \(3\frac{5}{9}+2\frac{1}{2}=\frac{32}{9}+\frac{5}{2}=\frac{64}{18}+\frac{45}{18}=\frac{109}{18}\)

b) \(7\frac{2}{3}-4\frac{1}{2}=\frac{23}{3}-\frac{9}{2}=\frac{46}{6}-\frac{27}{6}=\frac{19}{6}\)

Bài 3:

a) \(2\frac{3}{4}\times2=\frac{11}{4}\times2=\frac{11}{2}\)

b) \(6\times2\frac{2}{7}=6\times\frac{16}{7}=\frac{96}{7}\)

Bài 4:

a) \(4\frac{1}{3}:\frac{2}{3}=\frac{13}{3}\times\frac{3}{2}=\frac{13}{2}\)

b) \(\frac{2}{5}:3\frac{7}{8}=\frac{2}{5}:\frac{31}{8}=\frac{2}{5}\times\frac{8}{31}=\frac{16}{155}\)

Bài 5:

a) \(5\frac{2}{9}\times\frac{1}{2}=\frac{47}{9}\times\frac{1}{2}=\frac{47}{18}\)

b) \(\frac{3}{7}\times2\frac{3}{5}=\frac{3}{7}\times\frac{13}{5}=\frac{39}{35}\)

Bài 6:

a) \(3\frac{4}{5}+6\frac{2}{3}=\frac{19}{5}+\frac{20}{3}=\frac{57}{15}+\frac{100}{15}=\frac{157}{15}\)

b) \(4\frac{3}{4}-2\frac{1}{3}=\frac{19}{4}-\frac{7}{3}=\frac{57}{12}-\frac{28}{12}=\frac{29}{12}\)

Bài 7:

a) \(6\frac{2}{5}:2\frac{1}{2}=\frac{32}{5}:\frac{5}{2}=\frac{32}{5}\times\frac{2}{5}=\frac{64}{25}\)

b) \(2\frac{1}{2}\times2=\frac{5}{2}\times2=5\)

Bài 8:

a) \(8\frac{1}{5}-3\frac{1}{7}=\frac{41}{5}-\frac{22}{7}=\frac{287}{35}-\frac{110}{35}=\frac{177}{35}\)

b) \(3\frac{4}{5}\times\frac{1}{3}=\frac{19}{5}\times\frac{1}{3}=\frac{19}{15}\)

Bài 9:

a) \(2:3\frac{1}{3}=2:\frac{10}{3}=2\times\frac{3}{10}=\frac{3}{5}\)

b) \(5\frac{1}{3}:4=\frac{16}{3}\times\frac{1}{4}=\frac{4}{3}\)

Bài 10:

a) \(4\frac{1}{3}\times2\frac{1}{2}=\frac{13}{3}\times\frac{5}{2}=\frac{65}{6}\)

b) \(3\frac{2}{3}\times1\frac{5}{7}=\frac{11}{3}\times\frac{12}{7}=\frac{44}{7}\)

Bài 11: Phần nguyên của hỗn số \(4\frac{2}{7}\) là 4