Question

已知2x-y=1/3，xy=3求2x^4y^-x^3y^4的值

Answer 1

2x^4y^3-x^3y^4=x3y3(2x-y)=(xy)3(2x-y)=23×(1/3)=8/3

Answer 2

你好。
2x^4y^3-x^3y^4
=x³y³(2x-y)
=(xy)³(2x-y)
=3³×(1/3)
=9
不懂请追问。