1) (2.8 +(-3.9))+2.8 = -1.1 +2.8 = 1.72) (-4.5 + 7.2)+(-4.5) = 2.7 - 4.5 = -1.83) (-2.3 +(-6.2))+(-2.3) = -8.5 - 2.3 = -10.8
Ответы:1) 1.72) -1.83) -10.8
1) (2.8 +(-3.9))+2.8 = -1.1 +2.8 = 1.7
2) (-4.5 + 7.2)+(-4.5) = 2.7 - 4.5 = -1.8
3) (-2.3 +(-6.2))+(-2.3) = -8.5 - 2.3 = -10.8
Ответы:
1) 1.7
2) -1.8
3) -10.8