2. Раскройте скобки и найдите значение выражения: 1) 23,6 + (14,5 - 30,1) - (6,8 + 1,9) 2) 34,4- (18,1-5,6) + (-11,9 + 8) 3) 28,3 + (-1,8 + 6) - (18,2 - 11,7) 4) 1,4-(0,7-3,2)+6(1$$\frac{1}{3}$$-2$$\frac{1}{4}$$) 5) -2,8-(4,2-(1,7+(-2$$\frac{1}{3}$$+1$$\frac{5}{6}$$)))

1) $$23.6 + (14.5 - 30.1) - (6.8 + 1.9) = 23.6 + (-15.6) - 8.7 = 23.6 - 15.6 - 8.7 = 8 - 8.7 = -0.7$$ 2) $$34.4 - (18.1 - 5.6) + (-11.9 + 8) = 34.4 - 12.5 + (-3.9) = 34.4 - 12.5 - 3.9 = 21.9 - 3.9 = 18$$ 3) $$28.3 + (-1.8 + 6) - (18.2 - 11.7) = 28.3 + 4.2 - 6.5 = 32.5 - 6.5 = 26$$ 4) $$1.4 - (0.7 - 3.2) + 6(1\frac{1}{3} - 2\frac{1}{4}) = 1.4 - (-2.5) + 6(\frac{4}{3} - \frac{9}{4}) = 1.4 + 2.5 + 6(\frac{16 - 27}{12}) = 3.9 + 6(\frac{-11}{12}) = 3.9 - \frac{66}{12} = 3.9 - \frac{11}{2} = 3.9 - 5.5 = -1.6$$ 5) $$-2.8 - (4.2 - (1.7 + (-2\frac{1}{3} + 1\frac{5}{6}))) = -2.8 - (4.2 - (1.7 + (-\frac{7}{3} + \frac{11}{6}))) = -2.8 - (4.2 - (1.7 + (-\frac{14}{6} + \frac{11}{6}))) = -2.8 - (4.2 - (1.7 + (-\frac{3}{6}))) = -2.8 - (4.2 - (1.7 - 0.5)) = -2.8 - (4.2 - 1.2) = -2.8 - 3 = -5.8$$