计算题过程
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9(x+y+z)²-(x-y-z)²
=[3(x+y+z)]²-(x-y-z)²
=[3(x+y+z)+(x-y-z)]×[3(x+y+z)-(x-y-z)]
=(4x+2y+2z)(2x+4y+4z)
=4(2x+y+z)(x+2y+2z)
=[3(x+y+z)]²-(x-y-z)²
=[3(x+y+z)+(x-y-z)]×[3(x+y+z)-(x-y-z)]
=(4x+2y+2z)(2x+4y+4z)
=4(2x+y+z)(x+2y+2z)
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