设2x−yx+y=3,其中x,y≠0,则(2x−3y)3−(3x−2y)3(4x+2y)3−(x−7y)3=(  ) A.一l B.1 C.14134075 D.−14134075

问题描述:

2x−y
x+y
=3,其中x,y≠0,则
(2x−3y)3(3x−2y)3
(4x+2y)3(x−7y)3
=(  )
A. 一l
B. 1
C.
1413
4075

D.
1413
4075

2x−y
x+y
=3,
∴2x-y=3x+3y,x=-4y,
(2x−3y)3(3x−2y)3
(4x+2y)3(x−7y)3
=
(−11y)3(14y)3
(−14y)3(−11y)3
=-1.
故选A.