2x-y=4,xy=3,求2x^4y^3-x^3y^4的值

问题描述:

2x-y=4,xy=3,求2x^4y^3-x^3y^4的值

2x^4y^3-x^3y^4
=(xy)^3(2x-y)
=(3)^3 x4
=27x4
=108