“I never teach my pupils; I only attempt to provide the conditions in which they can learn.” ~ ALBERT EINSTEIN
将一张120 cm 长,80 cm 宽的长方形纸皮的四个角落
切割出四个大小相同的正方形,然后将剩余的纸皮摺成一长方体。
若此长方体的体积得要最大时,那被切割出来的四个正方形的边长应为多少?
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