6)($$\frac{17}{18}+\frac{5}{12}$$)+($$\frac{5}{8}-\frac{3}{14}$$); 7) $$\frac{7}{16}$$-(0,5-$$\frac{3}{8}$$).

6) ($$\frac{17}{18}+\frac{5}{12}$$)+($$\frac{5}{8}-\frac{3}{14}$$) = ($$\frac{17 \cdot 2}{18 \cdot 2}+\frac{5 \cdot 3}{12 \cdot 3}$$)+($$\frac{5 \cdot 7}{8 \cdot 7}-\frac{3 \cdot 4}{14 \cdot 4}$$) = $$\frac{34}{36}+\frac{15}{36}$$ + $$\frac{35}{56}-\frac{12}{56}$$ = $$\frac{49}{36}$$ + $$\frac{23}{56}$$ = $$\frac{49 \cdot 14}{36 \cdot 14}$$ + $$\frac{23 \cdot 9}{56 \cdot 9}$$ = $$\frac{686}{504}$$ + $$\frac{207}{504}$$ = $$\frac{893}{504}$$ = 1$$\frac{389}{504}$$.

7) $$\frac{7}{16}$$-(0,5 -$$\frac{3}{8}$$) = $$\frac{7}{16}$$-($$\frac{1}{2}-\frac{3}{8}$$) = $$\frac{7}{16}$$-($$\frac{1 \cdot 4}{2 \cdot 4}-\frac{3}{8}$$) = $$\frac{7}{16}$$-($$\frac{4}{8}-\frac{3}{8}$$) = $$\frac{7}{16}-\frac{1}{8}$$ = $$\frac{7}{16}-\frac{1 \cdot 2}{8 \cdot 2}$$ = $$\frac{7}{16}-\frac{2}{16}$$ = $$\frac{5}{16}$$.

Ответ: 6) 1$$\frac{389}{504}$$; 7) $$\frac{5}{16}$$