5(xy-x²)÷(xy/x²-2xy+y²)的-1次方×x²-y²/x² 其中x=1/2,y=-2/3
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/25 16:21:35
![5(xy-x²)÷(xy/x²-2xy+y²)的-1次方×x²-y²/x² 其中x=1/2,y=-2/3](/uploads/image/z/2519929-1-9.jpg?t=5%28xy-x%26%23178%3B%29%C3%B7%28xy%2Fx%26%23178%3B-2xy%2By%26%23178%3B%29%E7%9A%84-1%E6%AC%A1%E6%96%B9%C3%97x%26%23178%3B-y%26%23178%3B%2Fx%26%23178%3B+%E5%85%B6%E4%B8%ADx%3D1%2F2%2Cy%3D-2%2F3)
5(xy-x²)÷(xy/x²-2xy+y²)的-1次方×x²-y²/x² 其中x=1/2,y=-2/3
5(xy-x²)÷(xy/x²-2xy+y²)的-1次方×x²-y²/x² 其中x=1/2,y=-2/3
5(xy-x²)÷(xy/x²-2xy+y²)的-1次方×x²-y²/x² 其中x=1/2,y=-2/3
原式
=5x(y-x)× xy/(x-y)^2*(x+y)(x-y)/x^2
=-5y(x+y)
=-5*(-2/3)(1/2-2/3)
=-5/9