Given the coefficient of in the expansion of is 189,show that the_其他解答

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：253 ℃　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.