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B=-7+4-7-8+4-3=-25+8=-17
9 – 9 – ( – 3)
0 + 3
+3
b) – 7 + 4 – 7 – (8 – 4 + 3)
– 3 – 7 – ( 4 + 3)
– 3 – 7 – (+ 7)
–10 – 7
– 17
c) – 6 – [2 – (1 + 5)] – (– 3 + 1)
– 6 – [2 – (+6)] – (– 2)
– 6 – [2 – 6] +2
– 6 – [– 4] +2
– 6 + 4 + 2
– 2 + 2
0
d) 2 + 2 + 3 – [2 – (– 3)]
+7 – [2 + 3]
+7 – [+5]
+7 – 5
+ 2