4.Calcule: a)10-(-7)-1
b)25-(-6)-(-8)
c)-12-(-1)-6
d)(-14)-(+9)-(+4)
e)(-5)-(-3)-(-7)
f)(-8)-(-2)-(-6)
b)25-(-6)-(-8)
c)-12-(-1)-6
d)(-14)-(+9)-(+4)
e)(-5)-(-3)-(-7)
f)(-8)-(-2)-(-6)
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