\(\left(15-6\frac{13}{18}\right):11\frac{1}{27}-2\frac{1}{8}:1\frac{11}{40}\\ =\left(\frac{270}{18}-\frac{121}{18}\right):\frac{298}{27}-\frac{17}{8}:\frac{51}{40}\\ =\frac{149}{18}\cdot\frac{27}{298}-\frac{17}{8}\cdot\frac{40}{51}\\ =\frac{3}{4}-\frac{5}{3}\\ =\frac{9}{12}-\frac{20}{12}=\frac{-11}{12}\)
\(70\cdot\left(\frac{131313}{565656}+\frac{131313}{727272}+\frac{131313}{909090}\right)\\ =70\cdot\left(\frac{13}{56}+\frac{13}{72}+\frac{13}{90}\right)\\ =70\cdot13\cdot\left(\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\\ =910\cdot\left(\frac{45}{2520}+\frac{35}{2520}+\frac{28}{2520}\right)\\ =910\cdot\frac{3}{70}=39\)
