標題:
f.5 解方程 (20點) EMERGENT
發問:
請教我做圈住咗嗰3題 圖片參考：http://imgcld.yimg.com/8/n/HA00230702/o/701110270056713873486050.jpg 更新: 按右鍵「另存圖片」再開啟睇會清楚d 答案 : 7. 9,9/16 11. 90,131.8,228.2,270 14. 117649,1/49
最佳解答:
7 Ley y = √x4x + 9 = 15√x4y^2 - 15y + 9 = 0y = 3/4 or y = 3X = 9/16 or x = 911 Let y = cosθ3y^2 + 2y = 0y = 0 or y = -2/3So cosθ = 0 or cosθ = -2/3θ = 90,131.8,228.2,27014 Let y = log_7xy^2 - 4y - 12 = 0(y - 6)(y + 2) = 0y = -2 or y = 6log_7 x = -2 or log_7 x = 6logx/log7 = -2 or logx/log7 = 6logx = log(7^-2) or logx = log(7^6)x = 1/49 or 117649
其他解答:
f.5 解方程 (20點) EMERGENT
發問:
請教我做圈住咗嗰3題 圖片參考：http://imgcld.yimg.com/8/n/HA00230702/o/701110270056713873486050.jpg 更新: 按右鍵「另存圖片」再開啟睇會清楚d 答案 : 7. 9,9/16 11. 90,131.8,228.2,270 14. 117649,1/49
最佳解答:
7 Ley y = √x4x + 9 = 15√x4y^2 - 15y + 9 = 0y = 3/4 or y = 3X = 9/16 or x = 911 Let y = cosθ3y^2 + 2y = 0y = 0 or y = -2/3So cosθ = 0 or cosθ = -2/3θ = 90,131.8,228.2,27014 Let y = log_7xy^2 - 4y - 12 = 0(y - 6)(y + 2) = 0y = -2 or y = 6log_7 x = -2 or log_7 x = 6logx/log7 = -2 or logx/log7 = 6logx = log(7^-2) or logx = log(7^6)x = 1/49 or 117649
其他解答:
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