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b) -(-5)+(-6)-(-3)=2
c) (8)-(6)+(-7)-(-4)=-1
d) -(-3)-(2)+(-9)+(7)=-1
Lo único que tienes que hacer es quitar el paréntesis, multiplicar el signo y hacer sumas y restas.
= - 3 - 4 + 8
= - 7 + 8
= 1
b) - (-5) + (-6) - (-3)
= 5 - 6 + 3
= 8 - 6
= 2
c) (+8) - (+6) + (-7) - (-4)
= 8 - 6 -7 + 4
= 12 - 13
= -1
d) - (-3) - (+2) + (-9) + (+7)
= 3 - 2 - 9 +7
= 9 - 11
= -2