使得函数f(x)=1∕5x²-4∕5x-7∕5(a≤x≤b)的值域为[a,b](a
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![使得函数f(x)=1∕5x²-4∕5x-7∕5(a≤x≤b)的值域为[a,b](a](/uploads/image/z/3025179-27-9.jpg?t=%E4%BD%BF%E5%BE%97%E5%87%BD%E6%95%B0f%28x%29%3D1%E2%88%955x%26%23178%3B-4%E2%88%955x-7%E2%88%955%28a%E2%89%A4x%E2%89%A4b%29%E7%9A%84%E5%80%BC%E5%9F%9F%E4%B8%BA%5Ba%2Cb%5D%28a)
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使得函数f(x)=1∕5x²-4∕5x-7∕5(a≤x≤b)的值域为[a,b](a
使得函数f(x)=1∕5x²-4∕5x-7∕5(a≤x≤b)的值域为[a,b](a
使得函数f(x)=1∕5x²-4∕5x-7∕5(a≤x≤b)的值域为[a,b](a
^2是平方
f(x)=(x-2)^2/5-11/5,为开口向上的抛物线,所以x在[2,∞)上单调增,在(-∞,2]上单调减
1° 2≤a