y-x=3xy
x-y=-3xy
所以原式=[3(x-y)+4xy]/[(x-y)-2xy]
=[3(-3xy)+4xy]/[(-3xy)-2xy]
=-5xy/(-5xy)
=1来自：求助得到的回答
已知1\/x-1\/y=3,求(3x+4xy-3y)\/(x-2xy-y)的值
1\/x-1\/y通分=(y-x)\/xy=3 y-x=3xy x-y=-3xy 所以原式=[3(x-y)+4xy]\/[(x-y)-2xy]=[3(-3xy)+4xy]\/[(-3xy)-2xy]=-5xy\/(-5xy)=1
已知1\/x-1\/y=3 求(2x+3xy-2y)\/(x-2xy-y)的值
解：由已知1\/x-1\/y=3可得：y-x=3xy x-y=-3xy 则：（2x+3xy-2y)\/(x-2xy-y)=(2x-2y+y-x)\/[x-y+2\/3(x-y)]=(x-y)\/[5\/3(x-y)]=1\/5\/3 =3\/5
若1\/X-1\/y=3,求分式x+4xy-y\/3x-2xy-3y的值
解：因为1\/X-1\/y=3 所以（y-x)\/xy=3,y-x=3xy x-y=-3xy 所以（x+4xy-y）\/（3x-2xy-3y）=【（x+y)+4xy】\/【3（x-y)-2xy】=【-3xy+4xy】\/【3*(-3xy)-2xy】=xy\/(-11xy)=-1\/11
【初二数学】1\/x-1\/y=3,则分式(4x+3xy-4y)\/(x-2xy-y)=___
y-x=3xy 原式=[3xy-4(y-x)]\/(x-y-2xy)=(3xy-12xy)\/(-3xy-2xy)=-9xy\/(-5xy)=9\/5
已知1\/x-(1\/y)=3,则2x+3xy-2y\/(x-2xy-y)的值是多少
已知：1\/x-1\/y=3，求(2x+3xy-2y)\/(x-2xy-y)解：由已知：1\/x-1\/y=3，即(y-x)\/xy=3，(y-x)=3xy x-y=-3xy (2x+3xy-2y)\/(x-2xy-y)=(-6xy+3xy)\/(-3xy-2xy)=-3xy\/(-5xy)=3\/5
已知1\/x-1\/y=3,求分式(4x-5xy-4y)\/(3x-2xy-3y)的值
解：由1\/x-1\/y=3知 x-y=3xy(x,y不等于0)即 4x-4y=12xy 3x-3y=9xy 则 (4x-5xy-4y)\/（3x-2xy-3y）=(12xy-5xy)\/(9xy-2xy)=7xy\/7xy =1 小朋友，题目要自己思考的，不能总是在网上找答案，要自己学会思考啊。加油啊！！！
已知,1\/ x-1\/y=3
因为1\/x-1\/y=(x-y)\/xy=3 所以，x-y=3xy 所以，(2x+3xy－2y)\/(x－2xy－y)=[2(x-y)+3xy]\/[(x-y)-2xy]=(2*3xy+3xy)\/(3xy-2xy)=9xy\/xy =9
若1\/x-1\/y=3,则分式2x+3xy-2y\/x-2xy-y 的值为多少
解:1\/x-1\/y=3 原式明显是需要假约分，分子分母同时除以xy得(2\/y+3-2\/x)\/(1\/y-2-1\/x)=(-6+3)\/(-3-2)=(-3)\/(-5)=0.6 为你解答，如有帮助请采纳，如对本题有疑问可追问，Good luck!
已知1\/x-1\/y=3,求分式2x+3xy-2y\/x-2xy-y的值
解：∵1\/x-1\/y=3 ∴y-x=3xy x-y=-3xy 2x+3xy-2y\/x-2xy-y =[2(x-y)+3xy]\/[(x-y)-2xy]=(-6xy+3xy)\/(-3xy-2xy)=-3xy\/(-5xy)=3\/5 如果你认可我的回答，请及时采纳！不懂可追问，采纳是对每一个回答者最真挚的感谢，谢谢合作！希望对你有帮助。
已知1\/x-1\/y=3,求3x-5xy-3y\/x-2xy-y的值.
声明楼主所求式子很可能表述不正确，如是（3x-5xy-3y)\/(x-2xy-y），解法如下。由已知x≠0，y≠0，故等式左右同乘以xy得 y-x=3xy 所求式子化为：原式=[3(x-y)-5xy]\/[(x-y)-xy]=[(-9xy)-5xy]\/[(-3xy)-xy]=14xy\/4xy=7\/2 ...
