本题来自 Arrow, K. J., Chenery, H. B., Minhas, B. S., & Solow, R. M. (1961). Capital-labor substitution and economic efficiency. The Review of Economics and Statistics, 225-250.
该文引用 Hardy, G. H., Littlewood, J. E., & Pólya, G. (1952). Inequalities, chapter 2.
希望有高手详细算一下,最后一行的公式怎么来的?
谢谢。