**Решение:**
1) (-9.4 + 6.8 = -2.6)
2) (14.3 + (-8.7) = 14.3 - 8.7 = 5.6)
3) (-2.8 + (-7.6) = -2.8 - 7.6 = -10.4)
4) (4.7 + (-4.7) = 4.7 - 4.7 = 0)
5) (3.8 - 4.4 = -0.6)
6) (-16.7 - 5.5 = -22.2)
7) (-2.2 - (-15.1) = -2.2 + 15.1 = 12.9)
**Ответы:**
1) -2.6; 2) 5.6; 3) -10.4; 4) 0; 5) -0.6; 6) -22.2; 7) 12.9