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已知1x-1y=3,则分式2x+3xy-2yx-2xy-y的值为()A.15B.-15C.35D.-35
题目详情
已知
-
=3,则分式
的值为( )
A.
B. -
C.
D. -
1 |
x |
1 |
y |
2x+3xy-2y |
x-2xy-y |
A.
1 |
5 |
B. -
1 |
5 |
C.
3 |
5 |
D. -
3 |
5 |
▼优质解答
答案和解析
由
-
=3,得y-x=3xy,
∴x-y=-3xy,
∴
=
=
=
=
.
故选:C.
1 |
x |
1 |
y |
∴x-y=-3xy,
∴
2x+3xy-2y |
x-2xy-y |
2(x-y)+3xy |
(x-y)-2xy |
-6xy+3xy |
-3xy-2xy |
-3xy |
-5xy |
3 |
5 |
故选:C.
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