已知1/x - 1/y =5,则2X+5XY-2Y/X-2XY-Y 的值是...
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/08 22:09:58
![已知1/x - 1/y =5,则2X+5XY-2Y/X-2XY-Y 的值是...](/uploads/image/z/4338889-25-9.jpg?t=%E5%B7%B2%E7%9F%A51%2Fx+-+1%2Fy+%3D5%2C%E5%88%992X%2B5XY-2Y%2FX-2XY-Y+%E7%9A%84%E5%80%BC%E6%98%AF...)
x){}K
+t+lMuv465ԏ52"jyڰٌzzz6IEi/N]';ط鄞gӷ=9#"R镺@#J*M+*u*m,U[ rR@M
Cm#}SM&t'@#+57/.H̳y ;uo
已知1/x - 1/y =5,则2X+5XY-2Y/X-2XY-Y 的值是...
已知1/x - 1/y =5,则2X+5XY-2Y/X-2XY-Y 的值是...
已知1/x - 1/y =5,则2X+5XY-2Y/X-2XY-Y 的值是...
1/x-1/y=5,两边同时乘XY,得y-x=5XY
2x+5xy-2y=2x+y-x-2y=x-y
x-2xy-y=(x-y)(1+2/5)
2X+5XY-2Y/X-2XY-Y=(x-y)/(x-y)(1+2/5)=5/7