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解: 原式 = 5-{-4-[3-7-(4-5)]}-6
= 5 + 4 + [3-7-(4-5)] - 6
= 5 + 4 + 3 - 7 - (4 - 5) - 6
= 5 + 4 + 3 - 7 - 4 + 5 - 6
= 9 + 3 - 7 - 4 + 5 - 6
= 12 - 7 - 4 + 5 - 6
= 5 - 4 + 5 - 6
= 1 + 5 - 6
= 0
解: 原式 = 5-{-4-[3-7-(4-5)]}-6
= 5 + 4 + [3-7-(4-5)] - 6
= 5 + 4 + 3 - 7 - (4 - 5) - 6
= 5 + 4 + 3 - 7 - 4 + 5 - 6
= 9 + 3 - 7 - 4 + 5 - 6
= 12 - 7 - 4 + 5 - 6
= 5 - 4 + 5 - 6
= 1 + 5 - 6
= 0
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