题目内容
A.8x3n+1
B.6xn+3
C.8x3n+3
D.6x3n+3
(2xn+1)3等于
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如果
5xn+1+5xn
2xn+1+5xn-2x
2xn+1-5xn-2x
2xn+1+11xn-2x