How to know the answer of mathematical optimization design?

When you buy a book, you will get an answer.

Generally, after buying invisibility, manufacturers will prepare corresponding answers, so as to judge right or wrong after writing, find their own mistakes and better absorb knowledge points.

If it is an exercise that the teacher asks for in a unified way, the answer will generally be collected.

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What contribution did those scientists make during the Three Kingdoms, the Jin Dynasty and the Southern and Northern Dynasties?

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Do you have to practice more and do more problems to learn math well? Thank you for your questions.

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