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左下的算式很接近了
展開之後應該是 5t² - 44t + 148
= 5(t² - 44/5 t) + 148
= 5(t² - 44/5 t + (22/5)²) - 5(22/5)² + 148
t = 22/5 時有最小值
前面要配方的整項會變成 0
距離平方的最小值 = -5(22/5)² + 148
= -484/5 + 740/5
= 256/5
距離最小值 = √(256/5) = 16√5/5
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