已知1/y-1/x=3,求2x+3xy-2y/x-2xy-y的值
已知: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1/x-1/y=3,求 2X+3XY-2Y/X-2XY-Y 的值//!
已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值
已知1/x+1/y=8,求2x-3xy+2y/x+2xy+y的值
已知:1/X+1/Y=5,求 2x-3xy+2y/x+2xy+y的值,
已知1/x+1/y=3,求x+xy+y/2x-3xy+2y的值.
已知1/x+1/y=3,求x+xy+y/2x-3xy+2y的值
已知1/x+1/y=3,求分式3x-2xy+3y/x+xy+y的值
已知1/X-1/Y=-2,求3X-5XY-3Y/-X+3XY+Y的值
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