推 emptie : a-b =1 08/02 17:23
→ emptie : sqrt(a)-sqrt(b)<0.1 08/02 17:23
→ emptie : sqrt(b+1)-sqrt(b) <0.1 08/02 17:23
→ emptie : 移項平方展開 08/02 17:23
→ emptie : b+1<b+0.01+0.2sqrt(b) 08/02 17:23
→ emptie : sqrt(b)>4.95 , b>24.5025 08/02 17:23
推 emptie : 第一題 08/02 18:16
→ emptie : α = δ ，β = γ 08/02 18:16
→ emptie : 圖形對稱於x=7 08/02 18:16
→ emptie : f(x) = a(x-7)^2-13 08/02 18:16
→ emptie : f(3) = 16a-13 08/02 18:16
→ emptie : f(5) = 4a-13 08/02 18:16
→ emptie : 16a-13 與 4a-13 之中點亦為 7 08/02 18:16
→ emptie : 解得 a= 2，f(x) =2x^2 -28a +85 08/02 18:16
→ QQLeopard : 感謝解說 08/02 20:21