化简求值:若1/x-21/y=3,求(2x+3xy-2xy)/(x-2xy-y)的值
化简求值:若1/x-21/y=3,求(2x+3xy-2xy)/(x-2xy-y)的值
化简求值,若X方-2XY+Y方+1XY-11=0,求X方+6XY+9Y方分之X方-25Y方*5X-25Y分之X+3Y的值
数学分式化简求值题1/x - 1/y = 3 的时候求 2x + 3xy - 2y/x - xy -y 的值
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-1
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
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