Найдите значение выражения:

1) 7 + 5.31 + 9 + 13.49 = 34.8 2) 62.7 + 8.31 + 5.79 + 0.07 = 76.87 3) 8.31 - (4.29 + 3.721) = 8.31 - 8.011 = 0.299 4) (8.21 + 9.73) - 0.001 = 17.94 - 0.001 = 17.939 5) 3 : 1 1/2 + 5 : 1 1/4 = 3 : 3/2 + 5 : 5/4 = 3 * 2/3 + 5 * 4/5 = 2 + 4 = 6 6) 10 2/3 - 5 1/3 : 3 1/5 = 32/3 - 16/3 : 16/5 = 32/3 - 16/3 * 5/16 = 32/3 - 5/3 = 27/3 = 9 7) (10 2/3 - 5 1/3) : 3 1/3 = 5 1/3 : 3 1/3 = 16/3 : 10/3 = 16/3 * 3/10 = 16/10 = 1.6 8) 4 1/2 * 8/9 - 5 1/3 : 10 2/3 = 9/2 * 8/9 - 16/3 : 32/3 = 4 - 16/3 * 3/32 = 4 - 1/2 = 3.5 9) 0.7 * 1.3 + 5.1 : 0.17 = 0.91 + 30 = 30.91 10) 3.38 - 2.24 : 1.25 = 3.38 - 1.792 = 1.588 11) (3.38 - 2.24) : 1.25 = 1.14 : 1.25 = 0.912 12) 31.7 : 63.4 - 23.4 : 11.7 = 0.5 - 2 = -1.5