Question

tính gía trị biểu thức

2/5 + 3/5 : ( 3/5 + -2/3 ) - 3 1/2

Answer 1

       \(\frac{2}{5}+\frac{3}{5}:\left(\frac{3}{5}+\frac{-2}{3}\right)-3\frac{1}{2}\)

\(=\frac{2}{5}+\frac{3}{5}:\frac{-1}{15}-\frac{7}{2}\)

\(=\frac{2}{5}-9-\frac{7}{2}\)

\(=-12\frac{1}{10}\)

Answer 2

= 2/5 + 3/5 : (-1/15) - 7/2

= 2/5 -9 - 7/12

= -551/60

Tk mk nha

Answer 3

=\(\frac{2}{5}+\frac{3}{5}:\left(\frac{9}{15}+\frac{-10}{15}\right)-\frac{31}{2}\)

=\(\frac{2}{5}+\frac{3}{5}:\frac{1}{15}-\frac{31}{2}\)

=\(\frac{2}{5}+9-\frac{31}{2}\)

=\(\frac{4}{10}+\frac{90}{10}+\frac{64}{10}\)

=\(\frac{158}{10}\)