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\(\left(\frac{11}{5}:\frac{3}{19}\cdot\frac{2}{31}\right):\frac{-5}{19}\)
\(=\left(\frac{11\cdot19\cdot2}{5\cdot3\cdot31}\right)\cdot\frac{-19}{5}\)
\(=\frac{418\cdot\left(-19\right)}{465\cdot5}\)
\(=\frac{-7942}{2325}\)
\(\left(\frac{11}{5}:\frac{3}{19}\cdot\frac{2}{31}\right)\cdot\frac{-5}{19}\)
\(=\left(\frac{11}{5}\cdot\frac{19}{3}\cdot\frac{2}{31}\right)\cdot\frac{-19}{5}\)
\(=\frac{11\cdot19\cdot2\cdot\left(-19\right)}{5\cdot3\cdot31\cdot5}\)
\(=-\frac{7942}{2325}\)
\(=\frac{11}{-5}\cdot\frac{-9}{11}\cdot\frac{15}{-14}\cdot\frac{2}{5}+-\frac{2}{77}\cdot\frac{5}{-3}\)
\(=\frac{9}{5}\cdot-\frac{15}{14}\cdot\frac{2}{5}+\frac{10}{231}\)
\(=-\frac{841}{1155}\)
a) =-3/5 x (4/7 + 2/7 + 1) = -3/5 x 13/7 = -39/35
b) =8/11 x 5/19 + 7/19 x 8/11 - 8/11 x 1/15 = 8/11 x ( 5/19 + 7/19 - 1/15 ) = 8/11 x 161/285 = 1288/3235
**** cho mink nha
\(4.\left(\frac{1}{4}\right)^2+25\left[\left(\frac{3}{4}\right)^3:\left(\frac{5}{4}\right)^3\right]:\left(\frac{3}{2}\right)^3=4.\frac{1}{16}+25\left(\frac{27}{64}.\frac{64}{125}\right).\frac{8}{27}\)
\(=\frac{1}{4}+25.\frac{27}{125}.\frac{8}{27}=\frac{1}{4}+\frac{8}{5}=\frac{37}{20}\)
\(2^3+3\left(\frac{1}{2}\right)^0-1+\left[\left(-2\right)^2:\frac{1}{2}\right]-8=8+3-1+4.2-8=10\)
= -22 phan 93