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-2的平方是-4.(-2)的平方是4.是.
加括弧的負數,在平常中一樣的 但在某些計算中,加括弧和不加括弧就不一樣了 如-2^2和(-2)^2結果就不一樣了 前者為-4,後者為4
如果負在最前面一項就不要加括弧
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