1. Выполните действия: 1) 3,8 + (-4,4); 2) 7,6 - (-3,7); 3) 1 1/11 * (-2 2/11); 4) -12,72 : (-0,4);

1) $$3.8 + (-4.4) = -0.6$$
2) $$7.6 - (-3.7) = 7.6 + 3.7 = 11.3$$
3) $$1 \frac{1}{11} \times (-2 \frac{2}{11}) = \frac{12}{11} \times (-\frac{24}{11}) = -\frac{288}{121} = -2 \frac{46}{121}$$
4) $$-12.72 : (-0.4) = 31.8$$