Question

Chuyển hỗn số thành phân số rồi thực hiện phép tính

3\(\frac{2}{5}\)x 2\(\frac{1}{7}\), 8\(\frac{1}{6}\): 2\(\frac{1}{2}\)

Nhanh đúng cho 2 like

Answer 1

=17/5*15/7

=255/35=51/7

b)49/6:5/2

=245/12

Answer 2

\(3\frac{2}{5}=\frac{3\cdot5+2}{5}=\frac{17}{5}\)

\(2\frac{1}{7}=\frac{2\cdot7+1}{7}=\frac{15}{7}\)

\(8\frac{1}{6}=\frac{8\cdot6+1}{6}=\frac{49}{6}\)

\(2\frac{1}{2}=\frac{2\cdot2+1}{2}=\frac{5}{2}\)

\(3\frac{2}{5}\cdot2\frac{1}{7}=\frac{17}{5}\cdot\frac{15}{7}=\frac{51}{7}\)

\(8\frac{1}{6}:2\frac{1}{2}=\frac{49}{6}:\frac{5}{2}=\frac{49}{6}\cdot\frac{2}{5}=\frac{49}{15}\)