Thực hiện phép tính
a)\(\frac{3}{8}\) - \(\frac{1}{5}\) + \(\frac{3}{40}\)
b)\(\frac{21}{4}\) . \(\frac{3}{8}\) + \(\frac{43}{4}\) . \(\frac{3}{8}\) - 4 . \(\frac{1}{2}\)
c)\(\frac{-5}{9}\) + \(\frac{7}{15}\) + \(\frac{-2}{11}\) + \(\frac{4}{-9}\) + \(\frac{8}{15}\)
d) 125% . ( \(\frac{-1}{2}\) )\(^2\) : ( 1\(\frac{5}{6}\)- 1,5) + 2016\(^0\)
a) Ta có: \(\frac{3}{8}-\frac{1}{5}+\frac{3}{40}\)
\(=\frac{15}{40}-\frac{8}{40}+\frac{3}{40}\)
\(=\frac{10}{40}=\frac{1}{4}\)
b) Ta có: \(\frac{21}{4}\cdot\frac{3}{8}+\frac{43}{4}\cdot\frac{3}{8}-4\cdot\frac{1}{2}\)
\(=\frac{3}{8}\left(\frac{21}{4}+\frac{43}{4}\right)-2\)
\(=\frac{3}{8}\cdot16-2\)
\(=6-2=4\)
c) Ta có: \(\frac{-5}{9}+\frac{7}{15}+\frac{-2}{11}+\frac{4}{-9}+\frac{8}{15}\)
\(=\left(\frac{-5}{9}+\frac{-4}{9}\right)+\left(\frac{7}{15}+\frac{8}{15}\right)+\frac{-2}{11}\)
\(=-1+1+\frac{-2}{11}\)
\(=\frac{-2}{11}\)
d) Ta có: \(125\%\cdot\left(\frac{-1}{2}\right)^2:\left(1\frac{5}{6}-1.5\right)+2016^0\)
\(=\frac{5}{4}\cdot\frac{1}{4}:\left(\frac{11}{6}-\frac{3}{2}\right)+1\)
\(=\frac{5}{16}\cdot3+1\)
\(=\frac{15}{16}+\frac{16}{16}=\frac{31}{16}\)
