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設底面正方形的邊長是a,高為h 則1/3a^2h=根號2/3 即a^2h=根號2 側面的高是根號[h^2+(1/2a)^2] 正四棱錐的表面積是a^2+(1/2)a根號[h^2+(1/2a)^2]*4 =a^2+2a根號[h^2+(1/2a)^2] =a^2+根號(8+a^6) a不可能為0,好像沒有最小值
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