Question

Tính giá trị biểu thức : 

12/5 + 1/5 x 6 - 3/4

9/7 - 1/7 x 3 + 15/14

Answer 1

\(\frac{12}{5}+\frac{1}{5}\times6-\frac{3}{4}\)

\(=2,4+0,2\times6-0,75\)

\(=2,4+1,2-0,75\)

\(=3,6-0,75=2,85\)

\(\frac{9}{7}-\frac{1}{7}\times3+\frac{15}{14}\)

\(=\frac{9}{7}-\frac{3}{7}+\frac{15}{14}\)

\(=\frac{18}{14}-\frac{6}{14}+\frac{15}{14}\)

\(=\frac{12}{14}+\frac{15}{14}\)

\(=\frac{27}{14}\)

Answer 2

\(\frac{12}{5}+\frac{1}{5}\times6-\frac{3}{4}\)

\(=2,4+0,2\times6-0,75\)

\(=2,4+1,2-0,75\)

\(=3,6-0,75=2,85\)

\(\frac{9}{7}-\frac{1}{7}.3+\frac{15}{14}\)

\(=\frac{9}{7}-\frac{3}{7}+\frac{15}{14}\)

\(=\frac{6}{7}+\frac{15}{14}\)

\(=\frac{12}{14}+\frac{15}{14}=\frac{27}{14}\)