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Find the average rate of change for f(x) = 7x + 12 on [2,8]
人气：490 ℃　时间：2020-02-03 18:05:12
解答
f(x) = 7x + 12 on [2,8]
=[f(8)-f(2)]/(8-2)
=(56+12-14-12)/6
=7
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