作业帮lim(x→4)x^2-2x-8/x^2-16 求函数极值,
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lim(x→4)x^2-2x-8/x^2-16 求函数极值,
lim(x→4)x^2-2x-8/x^2-16 求函数极值,
lim(x→4)x^2-2x-8/x^2-16 求函数极值,
lim(x→4) (x^2-2x-8)/(x^2-16)
=lim(x→4) (x-4)(x+2) / (x-4)(x+4)
=lim(x→4) (x+2)/(x+4)
=6/8
=3/4
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