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ASPEN problem! I followed the example to carry out the operations, but an error occurred; I would appreciate some guidance from those with more experience

2020-02-12View Original

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Example 9.7 in Sun Lanyi’s textbook is an exercise on optimization and constraint conditions. I followed the steps outlined there, but an error occurred. I would appreciate guidance from those with more experience; thank you
Reply #22020-02-12
This post was last edited by 1005450746 on 2020-2-12 at 12:09. The example problems are as follows
Reply #32020-02-12
What does DLOG mean in the picture? Do we have to lose? Can I just enter what’s in the brackets?

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