為什麼只找到一個交點?

alex-jll shared this question 3 years ago
Answered

不知有那位大神遇到過下列狀況.. :|


Step1. 輸入 2x 畫出直線 f(x)

Step2. 輸入 2^x 畫出曲線 g(x)

Step3. 輸入 intersect[f, g] 畫出交點


妙的是..應該有兩個交點 (1,2) 與 (2,4)

但是..Geogebra 只找到 (1,2) 這個交點?? Thank you anyway!!

Comments (2)

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Sorry if I answer in English, but have problems with Chinese :smiley_cat:


In the input bar the Intersect command gives only one root for non-polynomials functions, so this is not a bug.

To obtain the second point you could e.g. use Intersect[f, g, 1.5,2.5]

(the syntax is Intersect[ <Function>, <Function>, <Start x-Value>, <End x-Value> ], please see http://www.geogebra.org/wik...)

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Thank you very much for your reply!! (I can read English as well) :laughing:

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