作者egg790724 (鸡蛋)
看板trans_math
标题[考古] 一些中正考古题96年
时间Wed Jul 8 11:25:25 2009
Consider the function f(x)=sin(2x)-2sin(x) ,where x[-π,π].f(x) has 3 points
of inflection and their x coordinates are given by _________.
The directional derivative of f(x,y,z)=x^2+yz at (1,-3,2) in the direction
of the path r(t)=t^2i+3tj+(1-t^3)k is_________.
这题的方向导数我会求，不过加上後面那句我不懂是什麽意思? 没见过这种题目@@
The value of the infinite series Σn=1→∞ n/(n+1)! is _________.
这几题不会@@
拜托大家救救我@@
快考试了ˊˋ
好烦阿>"<
谢谢了
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