1. Выполните действия: 1) 18 : (-6); 2) -552 : (-8); 3) 36*(-4); 4) -7,8*(-7); 5) -70,98 : (-14); 6) -42/55 : (-35/99); 7) -1 1/7 * 1 5/16; 8) 1 1/8 : (-3 3/8)

1) $$18 : (-6) = -3$$ 2) $$-552 : (-8) = 69$$ 3) $$36 \cdot (-4) = -144$$ 4) $$-7,8 \cdot (-7) = 54,6$$ 5) $$-70,98 : (-14) = 5,07$$ 6) $$-\frac{42}{55} : \left(-\frac{35}{99}\right) = \frac{42}{55} \cdot \frac{99}{35} = \frac{6 \cdot 9}{5 \cdot 5} = \frac{54}{25} = 2 \frac{4}{25} = 2,16$$ 7) $$-1\frac{1}{7} \cdot 1\frac{5}{16} = -\frac{8}{7} \cdot \frac{21}{16} = -\frac{1 \cdot 3}{1 \cdot 2} = -\frac{3}{2} = -1,5$$ 8) $$1\frac{1}{8} : \left(-3\frac{3}{8}\right) = \frac{9}{8} : \left(-\frac{27}{8}\right) = \frac{9}{8} \cdot \left(-\frac{8}{27}\right) = -\frac{1}{3}$$