Tính hợp lí
a,\(\frac{2}{13}\).\(\frac{-5}{3}\)+\(\frac{11}{13}\).\(\frac{-5}{3}\)
b,\(\left(\frac{-1}{3}\right)^2\)+\(\left(\frac{-1}{3}\right)^3\).27 + \(\left(\frac{-2017}{2018}\right)^0\)
c,\(1,2-\sqrt{\frac{1}{4}}\): \(1\frac{1}{20}\)+\(\left|\frac{3}{4}-1,25\right|\)-\(\left(\frac{-3}{2}\right)^2\)
\(\text{a,}\frac{2}{13}.\frac{-5}{3}+\frac{11}{13}.\frac{-5}{3}=-\frac{5}{3}\left(\frac{2}{13}+\frac{11}{13}\right)\)
\(=\frac{-5}{3}.\frac{13}{13}\)
\(=-\frac{5}{3}\)
\(\text{b,}\left(-\frac{1}{3}\right)^2+\left(-\frac{1}{3}\right)^3.27+\left(\frac{-2017}{2018}\right)^0=\frac{1}{9}-\frac{1}{27}.27+1\)
\(=\frac{1}{9}-1+1\)
\(=\frac{1}{9}\)
\(\text{c,}1,2-\sqrt{\frac{1}{4}}:1\frac{1}{20}+\left|\frac{3}{4}-1,25\right|-\left(\frac{-3}{2}\right)^2=\frac{6}{5}-\frac{1}{2}:\frac{21}{20}+\left|\frac{3}{4}-\frac{5}{4}\right|-\frac{9}{4}\)
\(=\frac{6}{5}-\frac{10}{21}+\frac{1}{2}-\frac{9}{4}\)
\(=\frac{-431}{420}\)
Thanks you !