Cut out a small square of 1 cm, 2 cm, 3 cm, and 4 cm from the four corners of a square thick paper with four sides of 12 cm. Then make them into cartons without lids, which one has the largest volume?
四个边长都是12厘米的正方形厚纸，在四角分别剪去一个小正方形1厘米、2厘米、3厘米、4厘米．然后分别做成没盖的纸盒，容积最大的是那个？
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