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用一個例子跟你說吧 (a+b)的平方=a的平方+2ab+b的平方 其中a的平方和b的平方就是第一項和第三項就是奇數項 2ab就是第二項偶數項了 (a+b)的平方是最簡單的二次項當不是平方是更多次的時候展開的道理是一樣的
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