1³+2³+3³+…+﹙n—1﹚³+n³=¼×﹙﹚²×﹙﹚²
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![1³+2³+3³+…+﹙n—1﹚³+n³=¼×﹙﹚²×﹙﹚²](/uploads/image/z/1024263-63-3.jpg?t=1%26%23179%3B%2B2%26%23179%3B%2B3%26%23179%3B%2B%E2%80%A6%2B%EF%B9%99n%E2%80%941%EF%B9%9A%26%23179%3B%EF%BC%8Bn%26%23179%3B%3D%26%23188%3B%C3%97%EF%B9%99%EF%B9%9A%26%23178%3B%C3%97%EF%B9%99%EF%B9%9A%26%23178%3B)
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1³+2³+3³+…+﹙n—1﹚³+n³=¼×﹙﹚²×﹙﹚²
1³+2³+3³+…+﹙n—1﹚³+n³=¼×﹙﹚²×﹙﹚²
1³+2³+3³+…+﹙n—1﹚³+n³=¼×﹙﹚²×﹙﹚²
1³+2³+3³+…+﹙n—1﹚³+n³=¼×﹙n﹚²×﹙n+1﹚²
分别填入n^2和(n-1)^2