作业帮[(x-y)²-(x+y)(x-y)]÷(-2y),计算,
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/12 02:07:10
![[(x-y)²-(x+y)(x-y)]÷(-2y),计算,](/uploads/image/z/629370-18-0.jpg?t=%5B%28x-y%29%26%23178%3B-%28x%2By%29%28x-y%29%5D%C3%B7%28-2y%29%2C%E8%AE%A1%E7%AE%97%2C)
[(x-y)²-(x+y)(x-y)]÷(-2y),计算,
[(x-y)²-(x+y)(x-y)]÷(-2y),计算,
[(x-y)²-(x+y)(x-y)]÷(-2y),计算,
[(x-y)²-(x+y)(x-y)]÷(-2y)
=[(x-y)²-(x²-y²)]÷(-2y)
=[(x²-2xy+y²)-(x²-y²)]÷(-2y)
=(x²-2xy+y²-x²+y²)÷(-2y)
=(2y²-2xy)÷(-2y)
=2y(y-x)÷(-2y)
=x-y