关于完全平方公式的2道题1.怎样添括号,才能利用完全平方公式计算：（-3x+2y-z）（3x+2y+z）=______2.计算:(x+y-z)(x-y+z)-(x+y+z)(x-y-z)

1.(-3x+2y-z）（3x+2y+z）=[2y-(3x+z)][2y+(3x+z)]=4y²-(3x+z)²=4y²-9x²-z²-6xz2.(x+y-z)(x-y+z)-(x+y+z)(x-y-z)=[x+(y-z)][x-(y-z)]-[x+(y+z)][x-(y+z)]=x²-(y-z)²-[x²-(y...