我的計算與外星人相同, 應該是正確的.
琦琦提出的答案看不到, 不知哪裡不一樣.
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由 大嘴 於 星期二 四月 11, 2006 11:39 am
[問題]這是課本的答案
由 琦琦 於 星期二 四月 11, 2006 1:23 am
由 ET外星人 於 星期日 四月 09, 2006 8:09 pm
#ed_op#DIV#ed_cl#f(x,y)=ln(x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#+y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#f#ed_op#SUB#ed_cl#x#ed_op#/SUB#ed_cl#=2x/(x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#+y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#f#ed_op#SUB#ed_cl#y#ed_op#/SUB#ed_cl#=2y/(x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#+y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#f#ed_op#SUB#ed_cl#xx#ed_op#/SUB#ed_cl#=(2(x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#+y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)-4x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)/(x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#+y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#SUP#ed_cl# #ed_op#/SUP#ed_cl#=(-2x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#+2y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)/(x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#+y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#f#ed_op#SUB#ed_cl#xy#ed_op#/SUB#ed_cl#=-4xy/(x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#+y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#DIV#ed_cl#f#ed_op#SUB#ed_cl#yy#ed_op#/SUB#ed_cl#=(2(x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#+y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)-4y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)/(x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#+y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#SUP#ed_cl# #ed_op#/SUP#ed_cl#=(2x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#-2y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)/(x#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#+y#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl#)#ed_op#SUP#ed_cl#2#ed_op#/SUP#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#SUP#ed_cl##ed_op#/SUP#ed_cl# #ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#SUP#ed_cl#不知道對不對#ed_op#/SUP#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#SUP#ed_cl#如有錯,請指教#ed_op#/SUP#ed_cl##ed_op#/DIV#ed_cl##ed_op#/DIV#ed_cl#
[數學][問題]試求fxx,fyy,fxy
由 琦琦 於 星期日 四月 09, 2006 6:45 pm
請大大幫忙~
