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b bạn gõ lại đề giúp mình nhé
A = \(\frac{4\left(\frac{1}{78}-\frac{1}{60}-\frac{1}{306}\right)}{9\left(\frac{1}{78}-\frac{1}{60}-\frac{1}{306}\right)}:\frac{1+\frac{2}{71}-\frac{5}{121}}{-13\left(1+\frac{2}{71}-\frac{5}{121}\right)}=\frac{4}{9}:-\frac{1}{13}\)
Đoán thôi
\(\text{a,}\frac{2}{13}.\frac{-5}{3}+\frac{11}{13}.\frac{-5}{3}=-\frac{5}{3}\left(\frac{2}{13}+\frac{11}{13}\right)\)
\(=\frac{-5}{3}.\frac{13}{13}\)
\(=-\frac{5}{3}\)
\(\text{b,}\left(-\frac{1}{3}\right)^2+\left(-\frac{1}{3}\right)^3.27+\left(\frac{-2017}{2018}\right)^0=\frac{1}{9}-\frac{1}{27}.27+1\)
\(=\frac{1}{9}-1+1\)
\(=\frac{1}{9}\)
\(\text{c,}1,2-\sqrt{\frac{1}{4}}:1\frac{1}{20}+\left|\frac{3}{4}-1,25\right|-\left(\frac{-3}{2}\right)^2=\frac{6}{5}-\frac{1}{2}:\frac{21}{20}+\left|\frac{3}{4}-\frac{5}{4}\right|-\frac{9}{4}\)
\(=\frac{6}{5}-\frac{10}{21}+\frac{1}{2}-\frac{9}{4}\)
\(=\frac{-431}{420}\)
\(\frac{13}{40}-\frac{11}{47}.\frac{1}{2}+\frac{1}{20}-\)\(\frac{121}{47.72}\)
\(=\left(\frac{13}{40}+\frac{1}{20}\right)-\)\(\left(\frac{11}{47}.\frac{1}{2}+\frac{121}{47.72}\right)\)
\(=\left(\frac{13}{40}+\frac{2}{40}\right)\)\(-\left(\frac{11}{47}.\frac{1}{2}+\frac{11}{47}.\frac{11}{72}\right)\)
\(=\frac{3}{8}-\frac{11}{47}.\left(\frac{1}{2}+\frac{11}{72}\right)\)
\(=\frac{3}{8}-\frac{11}{47}.\frac{47}{72}\)
\(=\frac{3}{8}-\frac{11}{72}\)
\(=\frac{27}{72}-\frac{11}{72}\)
\(=\frac{2}{9}\)