作业帮（xy-x²）÷[（x²-2xy+y²）÷xy]*[(x-y)÷x²]
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/29 07:06:20
![（xy-x²）÷[（x²-2xy+y²）÷xy]*[(x-y)÷x²]](/uploads/image/z/12964302-54-2.jpg?t=%EF%BC%88xy-x%26sup2%3B%EF%BC%89%C3%B7%5B%EF%BC%88x%26sup2%3B-2xy%2By%26sup2%3B%EF%BC%89%C3%B7xy%5D%2A%5B%28x-y%29%C3%B7x%26sup2%3B%5D)
（xy-x²）÷[（x²-2xy+y²）÷xy]*[(x-y)÷x²]
（xy-x²）÷[（x²-2xy+y²）÷xy]*[(x-y)÷x²]
（xy-x²）÷[（x²-2xy+y²）÷xy]*[(x-y)÷x²]
（xy-x2）÷[（x2-2xy+y2）÷xy]*[(x-y)÷x2]=x（y-x）÷[（x-y）2÷xy]*[(x-y)÷x2]=x(y-x)*[1/（x2-2xy+y2）]*(1/xy)]*[(x-y)(1/x2)]=-1