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(x-1/3)(x的平方+1/9)(X+1/3)
人气:116 ℃ 时间:2020-05-10 19:41:51
解答
(x-1/3)(x²+1/9)(x+1/3)
=(x-1/3)(x+1/3)(x²+1/9)
=(x²-1/9)(x²+1/9)
=x的4次方-1/81
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