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(9+9√5)/8
=(9/昌升睁16)(2+2√5)
=(9/耐岁16)(√5-1)^2
√ [(9+9√5)/8 ] =(3/4)(√5-1)
1/(1+b^2) + 9/(4b^2) =1
[4b^2 +9(1+b^2)] /笑芹 [4b^2.(1+b^2)] =1
4b^2 +9(1+b^2) =4b^2.(1+b^2)
13b^2 +9 = 4b^4 +4b^2
4b^4 -9b^2 -9 =0
b^2 = (9+9√5)/8
b=±(3/4)(√5-1)
=(9/昌升睁16)(2+2√5)
=(9/耐岁16)(√5-1)^2
√ [(9+9√5)/8 ] =(3/4)(√5-1)
1/(1+b^2) + 9/(4b^2) =1
[4b^2 +9(1+b^2)] /笑芹 [4b^2.(1+b^2)] =1
4b^2 +9(1+b^2) =4b^2.(1+b^2)
13b^2 +9 = 4b^4 +4b^2
4b^4 -9b^2 -9 =0
b^2 = (9+9√5)/8
b=±(3/4)(√5-1)
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