百度作业网就是这里弄不懂F（x）=x^2/x+1求导得F’（x）=[（x+1)*2x-x^2*1]/(x+1)^2=x^2+2x/
![就是这里弄不懂F（x）=x^2/x+1求导得F’（x）=[（x+1)*2x-x^2*1]/(x+1)^2=x^2+2x/](/uploads/image/z/2626282-10-2.jpg?t=%E5%B0%B1%E6%98%AF%E8%BF%99%E9%87%8C%E5%BC%84%E4%B8%8D%E6%87%82F%EF%BC%88x%EF%BC%89%3Dx%5E2%2Fx%2B1%E6%B1%82%E5%AF%BC%E5%BE%97F%E2%80%99%EF%BC%88x%EF%BC%89%3D%5B%EF%BC%88x%2B1%29%2A2x-x%5E2%2A1%5D%2F%28x%2B1%29%5E2%3Dx%5E2%2B2x%2F)
就是这里弄不懂F（x）=x^2/x+1求导得F’（x）=[（x+1)*2x-x^2*1]/(x+1)^2=x^2+2x/
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