(-3x²y)(1/3xy²)答案?

X²+xy²-x²-y²-3xy+2x+2y-1分解因式 (-3x²y)(1/3xy²)答案? (5x²y-2xy²-3xy)-(2xy+5x²y-2xy²),x=-1/5,y=-1/3 1 3x²+4xy-y²=2 4xy+1-4x²-y²= 若1/x+1/y=3,则2x-xy+2y/x-2xy+y的值是多少?还有已知x/y=2/7,求x²-3xy+2y²/2x²-3xy+2y&s后面这个应该是已知x/y=2/7，求x²-3xy+2y²/2x²-3xy+2y² 若x²+xy-2y²=0,则x²+3xy+y²/x²+y² x²+xy-2y²=0则x²+3xy+y²/x²+y² (1/3xy)²*(-12x²y²)÷(-4/3x³y) 已知xy=8满足x²y-xy²-x+y=56,求x²+y²x-3=y-2=z-1,求x²+y²+z²-xy-yz-zx因式分解 如图 计算：4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急 整式乘法..1.3xy（x²y-xy²+xy）-xy²（2x²-xy+2x）2.（x-1）（x²-4x+3）-x（x²-5x+2) -3x²（1/3xy-y²）+4x（x²y-xy²）+x³y,其中x＝1,y＝ 已知|x+2|+(y+1²=0,求x²+(2xy-3y²)-2(x²+xy-2y²)的值 (-½x²y)^3*(-3xy²）²(-1/2x²y）³×（-3xy²）² 1.(8xy-x²+y²)-(x²-y²+8xy)2.(2x²-1/2+3x)-4(x-x²+1/2)3.3x²-[7x-(4x-3)-2x²] 6x²y-9xy-xy²+3x²y 方程组{x²+y²=10(1)x²-3xy+2y²=0(2)怎么解 已知：x²-xy=1,4xy-3y²=-2,求x²-9xy+6y²-5的值