Часть 1.
Ответы :
1. Б
2.А
3.Г
4.В
5.А
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1.
(-1.4) + (-1.8) = -3.2
2.
9.9 - 6.25 = 3.65
6.8 - (-4.2) = 11
-3 1/6 - ( -2 1/3) = -5/6 = -0.83
-4 3/8 - 2 1/6 = -6 13/24
3.
12 - (-12) + 0 + (-23) + 23 = 12 - ( -12) + 0 = 12 - (-12) = 24
4.
-2.7 - (2.4 - 3.5) = -2.7 - (-1.1) = -2.7 + 1.1 = -1.6
5.
-у + 2.92 = 0.3
-у = 0.3 - 2.92
-у = -2.62
у = 2.62
Часть 2.
6.
8.65 - ( - (-2.34)) - 4.2 = 8.65 - 2.34 - 4.2 = 2.11