oblicz:
a) 3-15-5=
b)-7+11-6
c)5-(-12)-7+14
d)-2-(-8)-6-3
e)1,6 - 2 1/6 -1
f) -3 1/4+2,75-0,6
to: 2 1/6 to dwa i jedna szósta
3 1/4 trzy i jedna czwarta
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a) 3-15-5 = -12-5 = -17
b) -7+11-6 = 4-6 = -2
c) 5-(-12)-7+14 = 5+12-7+14 = 17-7+14 = 10+14 = 24
d) -2-(-8)-6-3 = -2+8-6-3 = 6-6-3 = 0-3 = -3
e) 1,6 - 2 1/6 - 1 = 16/10 - 13/6 - 1 = 48/30 - 65/30 - 30/30 = -17/30 - 30/30 = -47/30 = -1 17/30 (minus jeden i 17 trzydziestych)
f) -3 1/4 + 2,75 - 0,6 = -13/4 + 2 3/4 - 6/10 = -65/20 + 55/20 - 12/20 = -10/20 - 12/20 = -22/20 = -11/10 = -1,1