(3$$\frac{1}{4}$$+2$$\frac{1}{6}$$):$$\frac{2}{5}$$-2$$\frac{3}{5}$$⋅$$\frac{2}{3}$$-$$\frac{4}{9}$$

Ответ: 8$$\frac{8}{9}$$

1) 3$$\frac{1}{4}$$+2$$\frac{1}{6}$$ =$$\frac{13}{4}$$+$$\frac{13}{6}$$ =$$\frac{39+26}{12}$$ =$$\frac{65}{12}$$

2) $$\frac{65}{12}$$ :$$\frac{2}{5}$$ =$$\frac{65}{12}$$\times$$\frac{5}{2}$$ =$$\frac{325}{24}$$

3) 2$$\frac{3}{5}$$⋅$$\frac{2}{3}$$ =$$\frac{13}{5}$$⋅$$\frac{2}{3}$$ =$$\frac{26}{15}$$

4) $$\frac{325}{24}$$-$$\frac{26}{15}$$-$$\frac{4}{9}$$ =$$\frac{4875-208-80}{360}$$ =$$\frac{4587}{360}$$ =$$\frac{1529}{120}$$ =12$$\frac{89}{120}$$

Ответ: 12$$\frac{89}{120}$$