x-y=1 xy=-2,则(x+1)(y-1)等于?
已知x分之1+y分之1=-2,则x+xy+y分之x-xy+y的值等于
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?
实数X,Y满足X大于等于Y大于等于1和2X平方-xy-5x+y+4=o,则x+y的值
x-y=1 xy=-2,则(x+1)(y-1)等于?
1/x-1/y=3 求x-3xy-y/2x-xy-2y 等于多少
如果1\x-1\y=2,那么3x+5xy-3y\x-xy-y等于多少
若1/x+1/y=3,4y-2xy-4x/3x+xy-3x等于多少
若x+y=3,xy=1,则(-5x+2)-(3xy+5y)等于多少
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
1\x+1\y=8\x+y,则y\xy+x\xy=?
若X>1,Y>0,且满足XY=X的Y次方,X/Y=X的3Y次方,则X+Y等于?
1.x分之1+y分之1=5,则2x-5xy+2y除以x+2xy+y等于______