把下列格式分解因式 16（x+y）^2-25（x-y）^2
人气：459 ℃ 时间：2020-05-07 15:53:58
解答
16（x+y）^2-25（x-y）^2
=[4﹙x＋y﹚＋5﹙x－y﹚][4﹙x＋y﹚－5﹙x－y﹚]
=﹙9x－y﹚﹙9y－x﹚
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