14题怎么做呀,大神帮做下吧 100
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n= ∫(0->3) x^2 dx = (1/3)[x^3]|(0->3) = 9
(x^2-k/x)^n
=(x^2-k/x)^9
coef. of x^3 = 9C5 . (-k)^5 = -126k^5
coef. of x^6 = 9C4 . (-k)^4 = 126k^4
coef. of x^3=coef. of x^6
-126k^5 = 126k^4
k^4.(k+1) =0
k=-1
(x^2-k/x)^n
=(x^2-k/x)^9
coef. of x^3 = 9C5 . (-k)^5 = -126k^5
coef. of x^6 = 9C4 . (-k)^4 = 126k^4
coef. of x^3=coef. of x^6
-126k^5 = 126k^4
k^4.(k+1) =0
k=-1
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需要过程吗?k=-5/4
追问
过程是什么呀
我算的是1
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