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(-2x-y+3z)(2x+y+3z)
题目详情
(-2x-y+3z)(2x+y+3z)
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答案和解析
解(-2x-y+3z)(2x+y+3z)
=(3z-2x-y)(3z+2x+y)
=(3z-(2x+y))(3z+2x+y)
=(3z)²-(2x+y)²
=9z²-4x²-y²-4xy
=(3z-2x-y)(3z+2x+y)
=(3z-(2x+y))(3z+2x+y)
=(3z)²-(2x+y)²
=9z²-4x²-y²-4xy
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