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x的3n+1次方×x+3x的n+一次方×x的2n+1次方=?
人气:493 ℃ 时间:2019-08-18 03:04:54
解答
x^(3n+1)*x+3x^(n+1)*x^(2n+1)
=x^(3n+2)+3x^(n+1+2n+1)
=x^(3n+2)+3x^(3n+2)
=4x^(3n+2)
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