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=9-5-3+5-2-{4-7+2-2+1-8}-13=
=9-5-3+5-2-4+7-2+2-1+8-13=
=0
B)=-2-{7+[-5+4+3-2-6+4+11]-9+6-1}+17=
=-2-{7-5+4+3-2-6+4+11-9+6-1}+17=
=-2-7+5-4-3+2+6-4-11+9-6+1+17=
=+13