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![Rút gọn: A=[x^4-(x-1)^2]\/[(x^2+1)^2-x^2]+[x^2-(x^2-1)^2]\/[x^2(x+1)^2-1]+[x^2(x-1)^2-1]\/[x^4-(x+1)^2]](http://i.ytimg.com/vi/Qnzi4WwD8KY/mqdefault.jpg "Rút gọn: A=[x^4-(x-1)^2]\/[(x^2+1)^2-x^2]+[x^2-(x^2-1)^2]\/[x^2(x+1)^2-1]+[x^2(x-1)^2-1]\/[x^4-(x+1)^2]")