1...已知2x-y=4,xy=3,求2x四次方y三次方-x方y 2...若x三次方-x-1=0,求2x方-2x+20101.已知_数学解答

1...已知2x-y=4,xy=3,求2x四次方y三次方-x方y 2...若x三次方-x-1=0,求2x方-2x+2010
1.已知2x-y=4,xy=3,求2x四次方y三次方-x方y
2.若x三次方-x-1=0，求2x方-2x+2010

人气：420 ℃　时间：2020-02-05 21:10:13

解答

1、
2x^4y^3-x^2y
=2x(xy)^3-(xy)x
=54x-3x
=51x
已知2x-y=4,xy=3,可求得x值代入即可.