2x-y= 1/3,xy=2求2x 4 y 3 -x
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+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
.已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
已知x-y=3,xy=1,求(-2x+2x+3y)-(3xy+2y-2x)-(x+4y+xy)
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知1/x-1/y=3,求(3x+4xy-3y)/(x-2xy-y)的值
已知1/x+1/y=3,求3x-4xy+3y/(x+2xy+y)的值
1/x-1/y=4,求分式(3x+xy-3y)/(x-2xy-y)
若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值
已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)
xy=-2,x+y=3,求代数式(4xy+12y)+[7x-(3xy+4y-x)]