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去括弧法則: 1.括弧前面有“+”號,把括弧和它前面的“+”號去掉,括弧裏各項的符號不改變 2.括弧前面是“-”號,把括弧和它前面的“-”號去掉,括弧裏各項的符號都要改變. 例如:-(a5[次方]-6b)-(7+3b) =-a^5+6b-7-3b
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