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例如:a+(b+c-d)=a+b+c-d如果括弧前是-號,那麼去掉括弧後,原括弧裡面的數位的符號要做相應改變,+變成-,-變成+.例如:a-(b+c-d)= a - b - c+d.去括弧只要一個一個的按順序去就可以了.例如:a - { b - [c+d-(e+f)]}…
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