Analysis: All three teacups have to be turned three times, that is, odd times, and it is stipulated that two teacups must be lifted together to make the mouth of the teacup face up, so no matter how many times they are turned over, the total number of turns is even, and it is impossible to make all three teacups face up according to the conditions.
Extended data:
Problem-solving skills of quantitative relationship in civil service examination
1, quick calculation methods: substitution exclusion method, multiple characteristic method, assignment method, crossover method, and first and last number method.
2. Question types: engineering problems, travel problems, set problems, plane geometry, function images, and scale problems.
3. The first four types of maximum problem (pigeon hole principle type, set distribution type, arithmetic extreme value type and geometric extreme value type) are arranged and combined (although the difficulty is slightly higher and the frequency is too high, it is still listed as a five-star test center).
4. It is suggested to take the test first: multiple characteristic method, assignment method, scale problem, engineering problem, intersection method, travel problem, set problem, plane geometry, substitution arrangement method, head and tail number method, function image, which takes about 16 hours (referring to the time of basic digestion and absorption), and almost guarantees to do 60% of the quantity.
5. Followed by the first four types and combinations. The first four kinds of time is a little longer (6 hours), but it is not difficult to master; The arrangement and combination are moderate in content but high in thinking requirements, which can ensure that easy questions and general questions are worked out first (3 hours).