先算出(a+b+c+d+e)²的答案再看看这四个等式(其他三个在下面),四个答案的次数、项数、系数有什么特征(a+b)²=a²+2ab+b² (a+b+c)²=a²+b²+c²+2ab+2ac+2bc (a+b+c+d)²=a²
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![先算出(a+b+c+d+e)²的答案再看看这四个等式(其他三个在下面),四个答案的次数、项数、系数有什么特征(a+b)²=a²+2ab+b² (a+b+c)²=a²+b²+c²+2ab+2ac+2bc (a+b+c+d)²=a²](/uploads/image/z/14129060-68-0.jpg?t=%E5%85%88%E7%AE%97%E5%87%BA%EF%BC%88a%2Bb%2Bc%2Bd%2Be%EF%BC%89%26%23178%3B%E7%9A%84%E7%AD%94%E6%A1%88%E5%86%8D%E7%9C%8B%E7%9C%8B%E8%BF%99%E5%9B%9B%E4%B8%AA%E7%AD%89%E5%BC%8F%EF%BC%88%E5%85%B6%E4%BB%96%E4%B8%89%E4%B8%AA%E5%9C%A8%E4%B8%8B%E9%9D%A2%EF%BC%89%2C%E5%9B%9B%E4%B8%AA%E7%AD%94%E6%A1%88%E7%9A%84%E6%AC%A1%E6%95%B0%E3%80%81%E9%A1%B9%E6%95%B0%E3%80%81%E7%B3%BB%E6%95%B0%E6%9C%89%E4%BB%80%E4%B9%88%E7%89%B9%E5%BE%81%28a%2Bb%29%26%23178%3B%3Da%26%23178%3B%2B2ab%2Bb%26%23178%3B+%28a%2Bb%2Bc%29%26%23178%3B%3Da%26%23178%3B%2Bb%26%23178%3B%2Bc%26%23178%3B%2B2ab%2B2ac%2B2bc+%28a%2Bb%2Bc%2Bd%29%26%23178%3B%3Da%26%23178%3B)
先算出(a+b+c+d+e)²的答案再看看这四个等式(其他三个在下面),四个答案的次数、项数、系数有什么特征(a+b)²=a²+2ab+b² (a+b+c)²=a²+b²+c²+2ab+2ac+2bc (a+b+c+d)²=a²
先算出(a+b+c+d+e)²的答案
再看看这四个等式(其他三个在下面),四个答案的次数、项数、系数有什么特征
(a+b)²=a²+2ab+b²
(a+b+c)²=a²+b²+c²+2ab+2ac+2bc
(a+b+c+d)²=a²+b²+c²+d²+2ab+2ac+2ad+2bc+2bd+2cd
先算出(a+b+c+d+e)²的答案再看看这四个等式(其他三个在下面),四个答案的次数、项数、系数有什么特征(a+b)²=a²+2ab+b² (a+b+c)²=a²+b²+c²+2ab+2ac+2bc (a+b+c+d)²=a²
你看哈:首先是每个单独的自己先平方,然后就是混合的了,任意两个的乘积的两倍.
那么(a+b+c+d+e)²就应该是
a²+b²+c²+d²+e²+2ab+2ac+2ad+2ae+2bc+2bd+2be+2cd+2ce