16(x+y)^2—25(x—y)^2因式分解
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16(x+y)^2—25(x—y)^2因式分解16(x+y)^2—25(x—y)^2因式分解16(x+y)^2—25(x—y)^2因式分解16（x+y）^2-25（x-y）^2=[4﹙x＋y﹚＋5﹙x
16(x+y)^2—25(x—y)^2因式分解
16(x+y)^2—25(x—y)^2因式分解
16(x+y)^2—25(x—y)^2因式分解
16（x+y）^2-25（x-y）^2
=[4﹙x＋y﹚＋5﹙x－y﹚][4﹙x＋y﹚－5﹙x－y﹚]
=﹙9x－y﹚﹙9y－x﹚
16(x+y)^2—25(x—y)^2
=[4(x+y)+5(x-y)][4(x+y)-5(x-y)]
=(4x+4y+5x-5y)(4x+4y-5x+5y)
=(9x-y)(9y-x)
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