问题
解答题
若x,y满足
|
答案
7y(x-3y)2-2(3y-x)3,
=7y(x-3y)2+2(x-3y)3,
=(x-3y)2[7y+2(x-3y)],
=(x-3y)2(2x+y),
当
时,原式=12×6=6.2x+y=6 x-3y=1
若x,y满足
|
7y(x-3y)2-2(3y-x)3,
=7y(x-3y)2+2(x-3y)3,
=(x-3y)2[7y+2(x-3y)],
=(x-3y)2(2x+y),
当
时,原式=12×6=6.2x+y=6 x-3y=1