6. Вычислите: а) 18,45 - (-7,6); в) -5,6+(-3,7). 7. Выполните действия: a)-1$$\frac{1}{2}$$: 2,25: б)3,125 (-8): в)-2$$\frac{3}{4} \cdot \frac{8}{22} 8. Найдите значение дроби $$\frac{2\frac{7}{9} \cdot (-5\frac{2}{5}+2,4)}{-1\frac{1}{9}-\frac{1}{3}-\frac{2}{9}}$$

Задание 6

a) 18,45 - (-7,6) = 18,45 + 7,6 = 26,05

б) -5,6 + (-3,7) = -5,6 - 3,7 = -9,3

Задание 7

a) -1$$\frac{1}{2}$$ : 2,25 = -$$\frac{3}{2}$$ : $$\frac{9}{4}$$ = -$$\frac{3}{2}$$ $$\cdot$$ $$\frac{4}{9}$$ = -$$\frac{2}{3}$$

б) 3,125 $$\cdot$$ (-8) = -25

в) -2$$\frac{3}{4}$$ $$\cdot$$ $$\frac{8}{22}$$ = -$$\frac{11}{4}$$ $$\cdot$$ $$\frac{8}{22}$$ = -$$\frac{1}{1}$$ $$\cdot$$ $$\frac{2}{2}$$ = -1

Задание 8

$$\frac{2\frac{7}{9} \cdot (-5\frac{2}{5}+2,4)}{-1\frac{1}{9}-\frac{1}{3}-\frac{2}{9}}$$ = $$\frac{\frac{25}{9} \cdot (-\frac{27}{5}+\frac{12}{5})}{-\frac{10}{9}-\frac{3}{9}-\frac{2}{9}}$$ = $$\frac{\frac{25}{9} \cdot (-\frac{15}{5})}{-\frac{15}{9}}$$ = $$\frac{\frac{25}{9} \cdot (-3)}{-\frac{5}{3}}$$ = $$\frac{-\frac{25}{3}}{-\frac{5}{3}}$$ = $$\frac{25}{3}$$ $$\cdot$$ $$\frac{3}{5}$$ = $$\frac{5}{1}$$ = 5