分式计算:[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)
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分式计算:[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)
1.[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)的答案是0么?
我做出来分子全能约掉的.
2.[1/(1+1/x)+1/(1-1/x)]/{[1-1/(x+1)]/[1+1/(x-1)]}
1.[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)的答案是0么?
我做出来分子全能约掉的.
2.[1/(1+1/x)+1/(1-1/x)]/{[1-1/(x+1)]/[1+1/(x-1)]}
![分式计算:[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)](/uploads/image/z/19529241-33-1.jpg?t=%E5%88%86%E5%BC%8F%E8%AE%A1%E7%AE%97%EF%BC%9A%5B%28a-b%29%2F%28a%2Bb%29-%28a%2Bb%29%2F%28a-b%29%5D%2Fb%2F%28a%2Bb%29%2Bb%2F%28a-b%29)
[(a-b)/(a+b)-(a+b)/(a-b)]/b/(a+b)+b/(a-b)
={[(a-b)²-(a+b)²]/(a²-b²)}/{[(a-b)²+(a+b)²]/(a²-b²)}
=-4ab/(2a²+2b²)
=-2ab/(a²+b²)
![](http://img.wesiedu.com/upload/8/5a/85a3f4ae1090907a5942127ed3e3fcb6.jpg)
={[(a-b)²-(a+b)²]/(a²-b²)}/{[(a-b)²+(a+b)²]/(a²-b²)}
=-4ab/(2a²+2b²)
=-2ab/(a²+b²)
![](http://img.wesiedu.com/upload/8/5a/85a3f4ae1090907a5942127ed3e3fcb6.jpg)