计算:(3x-y+4)(3x+y-4)计算:(3x-y+4)(3x+y-4)

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计算:(3x-y+4)(3x+y-4)计算:(3x-y+4)(3x+y-4)计算:(3x-y+4)(3x+y-4)计算:(3x-y+4)(3x+y-4)计算:(3x-y+4)(3x+y-4)计算:(3

计算:(3x-y+4)(3x+y-4)计算:(3x-y+4)(3x+y-4)
计算:(3x-y+4)(3x+y-4)
计算:(3x-y+4)(3x+y-4)

计算:(3x-y+4)(3x+y-4)计算:(3x-y+4)(3x+y-4)
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(3x-y+4)(3x+y-4)
=[3x-(y-4)][3x+(y-4)]
=9x²-(y-4)²
=9x²-y²+8y-16