ๅ่ใซ
https://oshiete.goo.ne.jp/qa/10032901.html
https://e-yobi.net/extremum_difference/
https://manabitimes.jp/math/3907
Mathematics
Senior High
๐จ๐จใใฎๅ้กใฎ่งฃใๆนใๆใใฆใใ ใใ๐โโ๏ธ
็ญใใฏk=ยฑโ6/2ใงใ
8 f(x) = x3 - 2kx2-รฆ+2k ใฎๆฅตๅคงๅคใจๆฅตๅฐๅคใฎๅทฎใ4ใซใช
ใใจใใฎๅฎๆฐ kใฎๅคใๆฑใใใ [20็น]
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