如果(x+1)^2+|y+2|=0,求3/2x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3y^2-y^2
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知x-3y=0,求2x+yx
如果(x+1)^2+/y+2/=0,求代数式5xy-2/3x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3
如果(x+1)^2+|y-2|=0,求代数式5xy-3/2x^3y^2-4yx+1/2y^2x^3-1/2xy+3x^3
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
已知y=3xy+x,求代数式2x+3xy−2yx−2xy−y
若|x-y+3|与|x+y-1999|互为相反数,求x+2yx−y
3xy+xy+2x²y+yx²+3x²y等于多少
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
实数x、y、z满足x=6-3yx+3y-2xy+2z
1/x-1/y=3,求2x+3xy-2y/x-y
1/x-1/y=4,求分式(3x+xy-3y)/(x-2xy-y)