1（3X^2+2XY-1/2X)-(2X^2-XY+x)2 (1/2XY+Y^2+1)+(X^2-1/2XY-2Y^2-1)3 -(X^2Y+3XY-4)+3(X^2Y-XY+2)4 -1/4(2K^3+4K^2-28)+1/2(K^3-2K^2+4K)

计算：1-2x+x^2/x-x^3*xy+x^2y/x-x^2 1-(3xy-x)+【-2(2x+3xy)】 计算3xy[2xy-x(y-2)+x-1] 整式乘法..1.3xy（x²y-xy²+xy）-xy²（2x²-xy+2x）2.（x-1）（x²-4x+3）-x（x²-5x+2) 3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x) .(x+y-2)(x+y-2xy)+(xy-1)^2 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y [x(x^2-2x+3)-3x]/2分之1x^2[(2xy-3)(2xy+3)+(xy+3)^2]/xy (1)已知x+y=6,xy=-3,x^2y+xy^2=(2)x*[2-(1/x)]+(x/x^2-2x)*(x^2-4) xy(xy+1)+xy+3-2(x+y+1/2)-(x+y-1)^2因式分解 (-1/3xy)^2•[xy(2x-y)-2x(xy-y^2)] 因式分解x^2y^2+x^2y+xy^2+3xy+x+y+1 (-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)] 3xy(x²-1）-2x²（1/2xy+y/x） 计算：(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3 几道数学题：x-x^2分之x^2-1×1-y分之xy-x,（xy-x^2）÷xy分之x-y,x^2+x分之x-3÷（x^2-6x+9）谢谢! XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2)