a) 0,8 * (-0,3) - 0,6 * (-0,3) = -0,24 + 0,18 = -0,06
б) -$$\frac{3}{11}$$ $$\cdot$$ 0,4 – 0,4 $$\cdot$$ (-$$\frac{8}{11}$$) = -$$\frac{3}{11}$$ $$\cdot$$ 0,4 + 0,4 $$\cdot$$ $$\frac{8}{11}$$ = -$$\frac{3}{11}$$ $$\cdot$$ $$\frac{4}{10}$$ + $$\frac{4}{10}$$ $$\cdot$$ $$\frac{8}{11}$$ = -$$\frac{12}{110}$$ + $$\frac{32}{110}$$ = $$\frac{20}{110}$$ = $$\frac{2}{11}$$
в) -$$\frac{7}{8}$$ $$\cdot$$ $$\frac{4}{9}$$ + $$\frac{4}{9}$$ $$\cdot$$ $$\frac{1}{8}$$ = $$\frac{4}{9}$$ * (-$$\frac{7}{8}$$ + $$\frac{1}{8}$$) = $$\frac{4}{9}$$ * (-$$\frac{6}{8}$$) = $$\frac{4}{9}$$ * (-$$\frac{3}{4}$$) = -$$\frac{12}{36}$$ = -$$\frac{1}{3}$$
г) $$2\frac{2}{9}$$ $$\cdot$$ 3,7 – $$2\frac{2}{9}$$ $$\cdot$$ (-5,3) = $$2\frac{2}{9}$$ * (3,7 + 5,3) = $$\frac{20}{9}$$ * 9 = 20
д) (-1$$\frac{1}{2}$$ - 1$$\frac{1}{7}$$) $$\cdot$$ 14 = (-$$\frac{3}{2}$$ - $$\frac{8}{7}$$) * 14 = (-$$\frac{21}{14}$$ - $$\frac{16}{14}$$) * 14 = -$$\frac{37}{14}$$ * 14 = -37
е) ($$\frac{2}{5}$$ - $$\frac{3}{4}$$) $$\cdot$$ 20 = ($$\frac{8}{20}$$ - $$\frac{15}{20}$$) * 20 = -$$\frac{7}{20}$$ * 20 = -7