已知X=2.5,Y=1,求分式-X²+8XY-15Y²/X²-3XY-10Y²的值谢谢
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 04:53:57
![已知X=2.5,Y=1,求分式-X²+8XY-15Y²/X²-3XY-10Y²的值谢谢](/uploads/image/z/2096744-32-4.jpg?t=%E5%B7%B2%E7%9F%A5X%3D2.5%2CY%3D1%2C%E6%B1%82%E5%88%86%E5%BC%8F-X%26%23178%3B%2B8XY-15Y%26%23178%3B%2FX%26%23178%3B-3XY-10Y%26%23178%3B%E7%9A%84%E5%80%BC%E8%B0%A2%E8%B0%A2)
已知X=2.5,Y=1,求分式-X²+8XY-15Y²/X²-3XY-10Y²的值谢谢
已知X=2.5,Y=1,求分式-X²+8XY-15Y²/X²-3XY-10Y²的值
谢谢
已知X=2.5,Y=1,求分式-X²+8XY-15Y²/X²-3XY-10Y²的值谢谢
原式=-(x-3y)(x-5y)/(x-5y)(x+2y)=-(x-3y)/(x+2y)=-1/9
-(X-3Y)(X-5Y)/(X-5Y)(X+2Y)
=-X+3Y/X+2Y(X不等於5Y)
=0.5/4.5
=1/9