z3x2yz的精选

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...