Oblicz sprytnie:
a) 15 - (-11) -15 -11
b)-10-7- (-7) - 18
c) - 5/9 + 2/3 + 5/9 - 5/6 - 2/3
d) - 2/7 + 3/8 - 1/2 + 2/7 - 1/4 1/2
e) 1,1 + 2,2 + 3,3 + 4,4 + 5,5 + 6,6
f)- 3,7 + 2,85 + 4,7 - 4,85
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a) 15 - (-11) -15 -11 = 15+11-15-11 = 0
b)-10-7- (-7) - 18 = -10-7+7-18= -10-18= -28
c) - 5/9 + 2/3 + 5/9 - 5/6 - 2/3 = -5/9 + 4/6 + 5/9 -5/6 -4/6= -5/6
d) - 2/7 + 3/8 - 1/2 + 2/7 - 1/4 +1/2 = -2/7 + 3/8 - 2/4 + 2/7 - 1/4 + 2/4 = 3/8 - 2/8 = 5/8
e) 1,1 + 2,2 + 3,3 + 4,4 + 5,5 + 6,6 = 42
f)- 3,7 + 2,85 + 4,7 - 4,85 = - 0,85 - 0,15 = -1