作业帮化简求值[x（x²y²-xy）-y（x²-x²y²）]÷3x²y x=1 y=3特急
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/06 04:17:11
![化简求值[x（x²y²-xy）-y（x²-x²y²）]÷3x²y x=1 y=3特急](/uploads/image/z/5912750-38-0.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%5Bx%EF%BC%88x%26%23178%3By%26%23178%3B-xy%EF%BC%89-y%EF%BC%88x%26%23178%3B-x%26%23178%3By%26%23178%3B%EF%BC%89%5D%C3%B73x%26%23178%3By+x%3D1+y%3D3%E7%89%B9%E6%80%A5)
化简求值[x（x²y²-xy）-y（x²-x²y²）]÷3x²y x=1 y=3特急
化简求值[x（x²y²-xy）-y（x²-x²y²）]÷3x²y x=1 y=3
特急
化简求值[x（x²y²-xy）-y（x²-x²y²）]÷3x²y x=1 y=3特急
原式=(x3y2-x2y-x2y+x2y3)/3x2y
= x3y2/3x2y-2x2y/3x2y+x2y3/3x2y
=xy/3=2/3+y2/3
把x=1,y=3代入
=1×3/3-2/3+3^2/3=10/3