Вычисли устно пример 1. 1) 1.2-6

1. $$1.2 - 6 = -4.8$$ 2. $$\frac{1}{2} \cdot (-2) = -1$$ 3. $$-(\frac{7}{9}) \div (\frac{7}{9}) = -1$$ 4. $$(-3) \cdot (-\frac{1}{3}) = 1$$ 1. $$0.2 \cdot 6 \cdot 5 = 6$$ 2. $$(-2) \cdot 4 \cdot 5 = -40$$ 3. $$0.2 \cdot (-5) \cdot 6 = -6$$ 4. $$5 - (-0.2) \cdot (-4) = 5 - 0.8 = 4.2$$ 5. $$(-6) \cdot 0.4 \cdot (-5) = (-2.4) \cdot (-5) = 12$$ 6. $$(-6) \cdot (-4) \cdot (-3) = 24 \cdot (-3) = -72$$ 1. $$36 \div 3 = 12$$ 2. $$(-36) \div 2 = -18$$ 3. $$655 \div (-5) = -131$$ 4. $$(-0.4) \div 8 = -0.05$$ 5. $$(-80) \div (-16) = 5$$ 6. $$(-0.9) \div (-0.3) = 3$$ 1. $$2 - (-15) \div 3 = 2 - (-5) = 2 + 5 = 7$$ 2. $$(-0.4) \cdot (-5) \div 2 = 2 \div 2 = 1$$ 3. $$6 \cdot (-8) \div (-12) = -48 \div (-12) = 4$$ 4. $$(-6) \cdot (-12) \div (-8) = 72 \div (-8) = -9$$ 5. $$(-45) \div 3 \cdot (-2) = -15 \cdot (-2) = 30$$ 6. $$(-55) \div (-11) \cdot (-3) = 5 \cdot (-3) = -15$$ Найти числовое значение выражения: 1. $$a^2b^2c^2$$ при $$a = -1$$, $$b = -3$$, $$c = 2$$ $$(-1)^2 \cdot (-3)^2 \cdot 2^2 = 1 \cdot 9 \cdot 4 = 36$$ 2. $$\frac{a^2b}{c^2}$$ при $$a = -2$$, $$b = -1$$, $$c = -3$$ $$\frac{(-2)^2 \cdot (-1)}{(-3)^2} = \frac{4 \cdot (-1)}{9} = -\frac{4}{9}$$ 3. $$\frac{ab}{c^2}$$ при $$a = -2$$, $$b = -8$$, $$c = -1$$ $$\frac{(-2) \cdot (-8)}{(-1)^2} = \frac{16}{1} = 16$$ 4. $$\frac{a^2}{bc^2}$$ при $$a = 8$$, $$b = -1$$, $$c = -2$$ $$\frac{8^2}{(-1) \cdot (-2)^2} = \frac{64}{(-1) \cdot 4} = \frac{64}{-4} = -16$$