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Learning with tablets in german schools pres edmediaconf12 Lt
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1 : x= x : x+ 1
⇔x^2 = x + 1
⇔x^2 – x -1 = 0
二次方程式の解の公式から
x> 0よりx = (1 + √5)/2
この値をφで表す
- 4.
ところで、φ^2= φ+ 1
⇔φ-1= 1 / φ
⇔φ= 1 + 1 / φ
⇔φ= 1 + 1 / + 1 / )
(1 φ
⇔φ= 1 + 1 / 1 + (1 / + φ)}
{ 1
これを繰り替えしていくと
φ= 1 + 1 / + (1 / + (1 / + (1 / + (1 / + (1 / + …
(1 1 1 1 1 1
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