（3x²y-2x+1)(-2xy)等于多少?

计算:(1).(-2xy²)*(3x²y)² 1-x²+2xy-y² (x+y-2xy)(x+y-2)+(1-xy)² 越快越好（1）(xy²+3)(xy²+3)-2x(-x+y)（2）(x+2)(x²+4)( 因式分解 x²-3xy+2y²+x-2 2x²-xy+3x-y+1因式分解 已知x/y=3,求x²+2xy-3y²/x²-2xy+y² 已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值 |x+2y+3|+(2x+y)²=0求x²-xy+y² x/y=2,求分式x²-xy+3y²/x²+xy+6y² 3y/2x+2y＋2xy/x²+xy 2x/x²-64y²－1/x-8y (1/a+1/b 当k等于多少时,多项式2x²-7kxy+7xy+3y²+5y中不含xy项