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Answer 1

$\displaystyle \frac{(0,5+\frac{1}{4})*0,9 }{(6,6-6\frac{2}{5}):\frac{2}{3} }=\frac{(\frac{1}{2}+\frac{1}{4})*\frac{9}{10} }{(\frac{33}{5}-\frac{32}{5})*\frac{3}{2} }=\frac{\frac{3}{4}*\frac{9}{10} }{\frac{1}{5}*\frac{3}{2} }=\frac{\frac{27}{40} }{\frac{3}{10} }=\frac{9}{4}=2\frac{1}{4}=2,25$