1) 21 - (5 - (-7) + 2) = 21 - (5 + 7 + 2) = 21 - 14 = 72) 2 - (-1 + 7) - (-5) = 2 - 6 + 5 = 1 + 5 = 63) 50 - (27 - 15) - 21 = 50 - 12 - 21 = 38 - 21 = 174) -8.5 - 21.2 + (-1.5) - 1.7 = -8.5 - 21.2 - 1.5 - 1.7 = -32.95) -45.1 + 24.8 - 58.2 = -45.1 + 24.8 + 58.2 = 24.96) -5.6 + 5.7 - 8.2 + 0.6 = 5.7 - 8.2 - 5.6 + 0.6 = -7.5
1) 21 - (5 - (-7) + 2) = 21 - (5 + 7 + 2) = 21 - 14 = 7
2) 2 - (-1 + 7) - (-5) = 2 - 6 + 5 = 1 + 5 = 6
3) 50 - (27 - 15) - 21 = 50 - 12 - 21 = 38 - 21 = 17
4) -8.5 - 21.2 + (-1.5) - 1.7 = -8.5 - 21.2 - 1.5 - 1.7 = -32.9
5) -45.1 + 24.8 - 58.2 = -45.1 + 24.8 + 58.2 = 24.9
6) -5.6 + 5.7 - 8.2 + 0.6 = 5.7 - 8.2 - 5.6 + 0.6 = -7.5