已知1/x+1/y=3,求3x-4xy+3y/(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(3x+4xy-3y)/(x-2xy-y)的值
已知1/x+1/y=3,求3x-4xy+3y/(x+2xy+y)的值
已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值!
若x-y=4,xy=1,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|3-y|+|x+y|=0,求[2(x+y)-3(xy+4)]÷1/xy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 2X+3XY-2Y/X-2XY-Y 的值//!
已知1/x+1/y=3,求x+xy+y/2x-3xy+2y的值.