Question

Tính giá trị của biểu thức

A)1/6÷2/5+3/7

B)8/5 - 1/2 × 1/3 

c) 9/5 + 1/8 : 5/3 

d)  (1/3 + 1/2 ) × 1/7

 

Answer 1

a) \(=\frac{1}{6}x\frac{5}{2}+\frac{3}{7}\)

\(=\frac{5}{12}+\frac{3}{7}\)

\(=\frac{71}{84}\)

b) \(=\frac{8}{5}-\frac{1}{2}x\frac{1}{3}\)

\(=\frac{8}{5}-\frac{1}{6}\)

\(=\frac{43}{30}\)

Answer 2

a, \(\frac{1}{6}:\frac{2}{5}+\frac{3}{7}\)

\(=\frac{1}{6}\cdot\frac{5}{2}+\frac{3}{7}\)

\(=\frac{5}{12}+\frac{3}{7}\)

\(=\frac{71}{84}\)

b, \(\frac{8}{5}-\frac{1}{2}\cdot\frac{1}{3}\)

\(=\frac{8}{5}-\frac{1}{6}\)

\(=\frac{43}{30}\)

Answer 3

c) \(\frac{9}{5}+\frac{1}{8}x\frac{3}{5}\)

\(=\frac{9}{5}+\frac{3}{40}\)

\(=\frac{15}{8}\)

d) \(\frac{5}{6}x\frac{1}{7}\)

\(=\frac{5}{42}\)

Answer 4

c,\(\frac{9}{5}+\frac{1}{8}:\frac{5}{3}\)

\(=\frac{9}{5}+\frac{1}{8}\cdot\frac{3}{5}\)

\(=\frac{9}{5}+\frac{3}{40}\)

\(=\frac{15}{8}\)

d, \(\left(\frac{1}{3}+\frac{1}{2}\right)\cdot\frac{1}{7}\)

\(=\frac{5}{6}\cdot\frac{1}{7}\)

\(=\frac{5}{42}\)