x^3-2x^2y^2+3y^2的每项系数是什么,次数是什么

x(x-y)2-(y-x)3 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 [(x+2y)(x-2y)-(2x-y)²+(3x-y(2x-5y)]/(-x)的解答 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x (x+3y)的平方+2(x-y)(x+y)+(x-3y)的平方 2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方 计算：x+2y/x-y+2x/y-x-3y/x-y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 y=3(x-y),x=2(x-y)求x,y的值 [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/【(x-y)/x】的负二次方 (x-y)X(2x-2y)的平方X(3x-3y)的平方 2X(2X-3Y)-3Y(X+Y) (-2x y)^2-(3y-x)(-x-3y)