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Given the coefficient of in the expansion of is 189,show that the value of n = 7.）
我知道意思嗄～^^ coeffient后面是X^2;of后面是(1+3x)^n
人气：295 ℃ 时间：2019-10-26 01:13:38
解答
给膨胀系数赋值189时,显示结果是n等于7.
请参考选用.
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