一到数学填空题
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一到数学填空题
![](http://img.wesiedu.com/upload/e/29/e2975bd7a7f8adc1f8ce0e41679688c2.jpg)
![](http://img.wesiedu.com/upload/e/29/e2975bd7a7f8adc1f8ce0e41679688c2.jpg)
![一到数学填空题](/uploads/image/z/15798963-3-3.jpg?t=%E4%B8%80%E5%88%B0%E6%95%B0%E5%AD%A6%E5%A1%AB%E7%A9%BA%E9%A2%98)
(x-y)/(x+y)=(x-y)^2/(x^2-y^2)
=>
M/(x^2-y^2)=((2xy-y^2)+(x-y)^2)/(x^2-y^2)
=>
M=2xy-y^2+(x-y)^2=x^2
=》M=x^2
=>
M/(x^2-y^2)=((2xy-y^2)+(x-y)^2)/(x^2-y^2)
=>
M=2xy-y^2+(x-y)^2=x^2
=》M=x^2