x^3-2XY+y^2-5x-1降次幂
x^3-2XY+y^2-5x-1降次幂
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
5x^2y/-1/2xy*3xy^2
计算3xy[2xy-x(y-2)+x-1]
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
(1) -3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2
5xy平方-2x平方y+[3xy平方-(4xy-2x平方y-2x平方y)],其中x=-2,y=-1求值
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y
若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y)
已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值