已知xy分之x-y=3,则分式x-2xy-y分之2x+3xy-2y的值是_____谢谢了,
已知xy分之x-y=3,则分式x-2xy-y分之2x+3xy-2y的值是_____谢谢了,
数学人气:280 ℃时间:2020-05-13 22:26:42
优质解答
挺简单的 1/x-1/y=3 (y-x)/xy=3 y-x=3xy x-y=-3xy 所以(2x+3xy-2y)/(x-2xy-y) =[2(x-y)+3xy]/[(x-y)-2xy] =(-6xy+3xy)/(-3xy-2xy) =-3xy/(-5xy) =3/5
我来回答
类似推荐
猜你喜欢
- 11.Few of them hurt themselves in the accident last night,__________?(A) don't they (B) didn't they
- 2"无论发生什么事."用英语怎么说?
- 3You can’ imagine what great difficulty I had () his address A.to find B.of find C.finding D.abou
- 41/2.1/3,1/10,1/15,1/26,1/35之间有什么规律?
- 5如图,在四边形ABCD中,AE=CF,求证:四边形EBFD为平行四边形
- 6蔺相如对秦王说:“这块璧有点小毛病,让我指给您看.” 改为转述句
- 7三个带马字的成语组成的句子
- 8英语句子改错,5道题.
- 9已知函数f(x)=Asin(ωx+φ) x∈R(A>0,ω>0,0<φ<π/2)的图像如图所示
- 10(急!)英文作文,一封信!120-150个词之间