求文档:xy-5y+3x-15=0 怎样解这个方程式

求文档:xy-5y+3x-15=0 怎样解这个方程式 求文档: 因式分解 x²-6xy+9y²-5xz+15yz+6z& 求文档:分解因式：xy-1+x-yx(y+1)-(y+1)怎样化为x-1)(y+1) 已知X-XY-2Y=0求2X+3XY-Y/X-2XY+5Y 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 求文档:方程组X+y=7.xy=12怎么解sdfsd 3X^2+XY+Y=15 求XY. 已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值 x+3y=5xy,(x,y>0)求3x+y最小值 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知|-3x-4y|+|-5y-15|=0,求2xy+x/y-x平方的值 xy^2=-3,求-xy(x^2y^5-xy^3-y) 已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值. 已知xy^2=-2 求-xy(x^2y^5-xy^3-y) 已知xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值.已知xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值. 若（x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值 已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2 已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值