z3x2yz的知识精选

计算(-3x+2y-z)(3x+2y+z)=    .
问题详情:计算(-3x+2y-z)(3x+2y+z)=.【回答】4y2-9x2-6xz-z2【解析】(-3x+2y-z)(3x+2y+z)=[2y-(3x+z)][2y+(3x+z)]=4y2-(3x+z)2=4y2-9x2-6xz-z2.知识点:整式的乘法题型:填空题...
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