→ alamabarry:學了一招... 06/06 02:21
y=sqr(x^2-8x+41)+sqr(x^2+8x+17)
Find out the min. in y...
Thanks a lot...
P.S please solve it by the math. skills in high school math V.1...
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作者: charmingc (從南半球看月亮) 看板: teaching
標題: Re: [請益] 高中數學第一冊問題...
時間: Sun Jun 3 22:51:37 2007
※ 引述《CareYYH (Babies Breath)》之銘言:
: y=sqr(x^2-8x+41) +sqr(x^2+8x+17)
(x-4)^2+(5-0)^2 (x+4)^2+(1-0)^2
因此此題相當於 在X軸上找一點 到(4,5) 和(-4,1) 最短距離
: Find out the min. in y...
: Thanks a lot...
: P.S please solve it by the math. skills in high school math V.1...
--
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