若x^3+y^3=1000,且x^2y-xy^2=-496,求(x^3-y^3)+(4xy^2-2x^2y)-2(xy^2-y^3)的值

若x/2=y/3,且x+y=10,则x=?y=? 若|x|=2,|y|=3,且y/2+x《0则x+y 若x、y互为相反数,且2x-3y=5,则x+y=? 若|x|=3,|y|=2,且x＞y,求x+y的值. 若｜x｜=3,｜y｜=2,且｜x－y｜=y－x,求x+y的值. 若|x|=3,|y|=2,且|x-y|=y-x,求x+y的值 若|x|=3,|y|=2,且|x-y|=y-x,求x+y的值 若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,求X,Y的值? 若x,y为正整数,且满足3x(x+y)-y(x+y)=7,求x,y |x|=2,|y|=3,且x·y 若x>0,y>0,且√x(√x+√y)=3√y(√x+5√y),求2x+2√x*√y+3y/x-√x*√y+y 若x-3y=0,且x≠0,2x+5y/3x-y的直是? ·若x.y互为相反数,且（x+y+3)(x-y-2)=6,则x等于几 若x:y=2:3,且3x+2y=60,则x= 若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 x y互为相反数 且x+3y=4,3x-2y= (x+y)(x+y-10)+25=0,且x-y=3,求x,y (x+y)(x+y-10)+25=0,且x-y=3,求x,y