已知2x-y=0.5,xy=2,求4x^y-4x^3y^3+x^2y^4
问题描述:
已知2x-y=0.5,xy=2,求4x^y-4x^3y^3+x^2y^4
已知2x-y=0.5,xy=2,求4x^y-4x^3y^3+x^2y^4的值
答
4x^4y^2-4x^3y^3+x^2y^4
=x^2y^2(4x^2-4xy+y^2)
=x^2y^2(2x-y)^2
=4*0.25
=1