如果f(x)的导数大于等于零.(.)设f(x)在(负无穷到正无穷)内可导,且对任意x1,x2,当x1>x2是,都有f(x1)>f(x2),则.(B)对任意x,f'(-x)小于等于0 为什么选项(B)错了.我是这么想的:原来函数是
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![如果f(x)的导数大于等于零.(.)设f(x)在(负无穷到正无穷)内可导,且对任意x1,x2,当x1>x2是,都有f(x1)>f(x2),则.(B)对任意x,f'(-x)小于等于0 为什么选项(B)错了.我是这么想的:原来函数是](/uploads/image/z/2624334-6-4.jpg?t=%E5%A6%82%E6%9E%9Cf%28x%29%E7%9A%84%E5%AF%BC%E6%95%B0%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E%E9%9B%B6.%EF%BC%88.%EF%BC%89%E8%AE%BEf%28x%29%E5%9C%A8%28%E8%B4%9F%E6%97%A0%E7%A9%B7%E5%88%B0%E6%AD%A3%E6%97%A0%E7%A9%B7%EF%BC%89%E5%86%85%E5%8F%AF%E5%AF%BC%2C%E4%B8%94%E5%AF%B9%E4%BB%BB%E6%84%8Fx1%2Cx2%2C%E5%BD%93x1%3Ex2%E6%98%AF%2C%E9%83%BD%E6%9C%89f%EF%BC%88x1%EF%BC%89%3Ef%EF%BC%88x2%EF%BC%89%2C%E5%88%99.%EF%BC%88B%EF%BC%89%E5%AF%B9%E4%BB%BB%E6%84%8Fx%2Cf%27%28-x%29%E5%B0%8F%E4%BA%8E%E7%AD%89%E4%BA%8E0+%E4%B8%BA%E4%BB%80%E4%B9%88%E9%80%89%E9%A1%B9%EF%BC%88B%EF%BC%89%E9%94%99%E4%BA%86.%E6%88%91%E6%98%AF%E8%BF%99%E4%B9%88%E6%83%B3%E7%9A%84%EF%BC%9A%E5%8E%9F%E6%9D%A5%E5%87%BD%E6%95%B0%E6%98%AF)
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