若x,y满足等式|x+2|+(y-3)^2=0,则(5x^2 y+5xy-7x)-(4x^2y+5xy-7x)的值为?
若x,y满足等式|x+2|+(y-3)^2=0,则(5x^2 y+5xy-7x)-(4x^2y+5xy-7x)的值为?
若实数x,y满足1/x-1/y=5,则分式3x-2xy-3y/x+xy-y的值等于?
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知xy满足方程组2x+y=5+m 4x+7y=1+3m则x-2y的值为
若(3xy+2)+|7-x-y|=0,求代数式(5xy+10y)-[-5x-(4xy-2y+3x)]的值.
实数xy满足1≤y≤x,且2x²-5x+4=y(x-1),则x+y的值为
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值