a)
[tex]1 \div (1 \div \frac{11}{30} - 1.5) + 2 {}^{ - 3} \div \frac{27}{40} = \\ \\ = 1 \div (1 \times \frac{30}{11} - \frac{15}{10} {}^{(5} ) + (\frac{1}{2} ) {}^{3} \times \frac{40}{27} = \\ \\ = 1 \div ( {}^{2)} \frac {30}{11} - {}^{11)} \frac{3}{2} ) + \frac{1}{8} \times \frac{40}{27} = \\ \\ = 1 \div \frac{60 - 33}{22} + \frac{5}{27} = \\ \\ = 1 \div \frac{27}{22} + \frac{5}{27} = \\ \\ = 1 \times \frac{22}{27} + \frac{5}{27} = \\ \\ = \frac{22 + 5}{27} = \\ \\ = \frac{27}{27} = \\ \\ = \boxed{ 1}[/tex]
pe al 3 lea rand am făcut o simplificare prin 8 prin taiere (vezi poza)
Scuze, dar la b) nu am reușit să fac
