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求第三题详细,谢谢了
展开全部
f(x)=x² - x + 1
f(-1) = 3, f(4) = 13
[f(4) - f(-1)]/[4 - (-1)] = (13 - 3)/5 = 2
f'(x) = 2x - 1 = 2, x = 3/2
答案D
f(-1) = 3, f(4) = 13
[f(4) - f(-1)]/[4 - (-1)] = (13 - 3)/5 = 2
f'(x) = 2x - 1 = 2, x = 3/2
答案D
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