Re: [中學] 對數方程式

看板Math作者Tiderus (修煉人生)時間10年前 (2016/01/15 02:40)推噓1(1推 0噓 0→)

留言1則, 1人參與討論串3/6 (看更多)

※ 引述《revengeiori (大笨宗)》之銘言： : 如圖 : http://i.imgur.com/VexglHE.jpg

: 右邊有點不太清楚 : 求 |f(x) - g(x)| + |f(x) + g(x)| = 3 之解 : 麻煩大家了 : ----- : Sent from JPTT on my Sony C6902. ｜log_x(4)-(1+log_x(3))｜ + ｜log_x(4)+(1+log_x(3))｜ = 3 |log_x(4/3x)| + |log_x(12x)| = 3 I. log_x(4/3x) + log_x(12x) = ±3 16 = x^3 => x = 2^(4/3) 16 = x^(-3) => x = 2^(-4/3) II. log_x(4/3x) - log_x(12x) = ±3 1/9x^2 = x^3 => x = 3^(-2/5) 1/9x^2 = x^(-3) => x = 9 -- http://attachment.van698.com/forum/201511/30/225019fywnza6atswsh36t.gif

http://attachment.van698.com/forum/201511/30/2247467wh1n1wagjjrm5lb.gif

http://attachment.van698.com/forum/201511/30/224343uai8w8dmstazimtq.gif

http://attachment.van698.com/forum/201511/30/224520cq25q2ccga5ff05l.gif

http://attachment.van698.com/forum/201511/30/2246449gvqz6z6bwgbgfoq.gif

迷途中唯一的導航是對自己誠實 -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 123.240.91.95 ※ 文章網址: https://www.ptt.cc/bbs/Math/M.1452796851.A.CE6.html ※ 編輯: Tiderus (123.240.91.95), 01/15/2016 02:42:44

推

revengeiori

01/15 03:22, , 1^F

01/15 03:22, 1^F

※ 編輯: Tiderus (123.240.91.95), 01/15/2016 14:52:02

‣ 返回看板[ Math ] 數學

‣ 更多 Tiderus 的文章

文章代碼(AID): #1Mb-kppc (Math)