当(x-y)/(x+y)=2时,代数式(x-y)/(x+y)-(2X+2Y)/(X-Y)的值是快.过时不候
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 22:25:52
![当(x-y)/(x+y)=2时,代数式(x-y)/(x+y)-(2X+2Y)/(X-Y)的值是快.过时不候](/uploads/image/z/1671242-50-2.jpg?t=%E5%BD%93%28x-y%29%2F%28x%2By%29%3D2%E6%97%B6%2C%E4%BB%A3%E6%95%B0%E5%BC%8F%28x-y%29%2F%28x%2By%29-%282X%2B2Y%29%2F%28X-Y%29%E7%9A%84%E5%80%BC%E6%98%AF%E5%BF%AB.%E8%BF%87%E6%97%B6%E4%B8%8D%E5%80%99)
当(x-y)/(x+y)=2时,代数式(x-y)/(x+y)-(2X+2Y)/(X-Y)的值是快.过时不候
当(x-y)/(x+y)=2时,代数式(x-y)/(x+y)-(2X+2Y)/(X-Y)的值是
快.过时不候
当(x-y)/(x+y)=2时,代数式(x-y)/(x+y)-(2X+2Y)/(X-Y)的值是快.过时不候
因为(x-y)/(x+y)=2 所以(x+y)/(x-y)=1/2;
(2X+2Y)/(X-Y)=2*[(x+y)/(x-y)]=1
所以答案为2-1=1
等-2
原式=2-2(1/2)=2-1=1