[(X+3)(X-3)]²怎么算
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[(X+3)(X-3)]²
咨询记录 · 回答于2023-02-03
[(X+3)(X-3)]²怎么算
[(X+3)(X-3)]²
(X+3)^2(X-3)^2
=(x^2十6x十9)(x^2一6x十9)
=x^4一6x^3+9x^2十6x^3一36x^2十54x十9x^2一54x十81
=(x^2一9)^2
[(X+3)(X-3)]²=(x^2一9)²