a (-0,8) - (-0,8)
b (-15) + (-3)
c (-21) - (-15)
a)=-0,8+0,8=0
b)=-18
c)-21+15=-6
a (-0,8) - (-0,8)=-0,8+0,8=0b (-15) + (-3)=-15-3=-18c (-21) - (-15)=-21+15=-6
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a)=-0,8+0,8=0
b)=-18
c)-21+15=-6
a (-0,8) - (-0,8)=-0,8+0,8=0
b (-15) + (-3)=-15-3=-18
c (-21) - (-15)=-21+15=-6