X+Y=1/8.XY=1.5求X,Y
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
x>1,y>0,且满足xy=x^y,x/y=x^3y,求x+y
x+y=1,xy=-1/2,求x(x+y)(x-y)-x(x+y)2
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+2(xy+y)的值
已知X+Y=-1,xy=-2,求代数式-5(x+y)+(x-y)+(xy+y)的值
已知:x-y=1,xy=-2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
x-y=1,xy=2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
.已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
1/x-1/y=3,求2x+3xy-2y/x-y