锛坸+y)虏-16(x-y)虏
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锛坸+y)虏-16(x-y)虏锛坸+y)虏-16(x-y)虏锛坸+y)虏-16(x-y)虏(x+y)²-16(x-y)²=[(x+y)+4(x-y)][(x+y)-4(x-y)]=
锛坸+y)虏-16(x-y)虏
锛坸+y)虏-16(x-y)虏
锛坸+y)虏-16(x-y)虏
(x+y)²-16(x-y)²
=[(x+y)+4(x-y)][(x+y)-4(x-y)]
=(x+y+4x-4y)(x+y-4x+4y)
=(5x-3y)(5y-3x)
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