There is a type of question called true and false questions in the line test test, and the conventional idea is to use the characteristics of contradictory relationships to solve the questions, but there is often no contradictory relationship in the true and false questions in naïve logic, so that many students do not know how to solve the questions.
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Today, I will introduce to you how to solve this kind of true and false questions.01 For the question of whether there is a contradiction between the truth and the falsehood, we can judge whether the conclusion and the question stem are contradictory by assuming that one of the sentences is true or false. If it contradicts the conditions of the question stem, the assumption is not true, and if the conclusion is presented that meets the conditions of the question stem, the assumption is true, and the problem can be easily solved. Next, let's feel it together through specific topics:
Example 1] A, B, C, and D are four beautiful girls who like to wear beautiful clothes, and one day, they wear different colors of clothes, including yellow, green, blue, and red. When asked about the color of their clothes, A said, "B's clothes are not yellow. B said, "C's clothes are green." C said, "D's garment is not blue." D said, "One of the three men A, B, and C had green clothes, and only this man was telling the truth." ”
If d is telling the truth, then the following statement is true:
a.C's garment is blue, and D's garment is green.
b.B's clothes are blue, and C's clothes are red.
c.A's clothes are green, and B's clothes are red.
d.D's garment is green, and A's garment is red.
Analysis] c. From D's words, it is clear that the clothes of those who tell the truth are green. Only what B said mentions green is a hypothesis that can be used as a breakthrough. Assuming that what B says is true, then the contradictory relationship between the clothes of B and C is green, and the clothes of only one person are green, so the hypothesis is not valid. Therefore, if B's words are false, you can be sure that C's clothes are not green, and if you are sure that C is lying, then D's clothes are blue. If one of A, B, and C tells the truth, then only A tells the truth, and only A wears green clothes, so B's clothes are not yellow, but red. C's clothes are yellow. Therefore, the answer is C.
02 In addition to the fact that the above sentences are true and false, there is also a situation of half-truths and half-truths, that is, a person has said two sentences, one is true and one is false. For this kind of question, if the information of the option is comprehensive and certain, we can do the question by substituting the elimination method, that is, assuming that the option is true, to see if all the expressions of the question stem are half-true and half-false, if it is satisfied, it is the correct option, let's take a look at an example question:
Example 2] There are 3 sprint events in a track and field event, which are 60 meters, 100 meters and 200 meters. Lao Zhang, Lao Wang and Lao Li each participated in one of them, and the three of them participated in different projects. Xiao Zhang, Xiao Wang and Xiao Li did.
The following guesses: Xiao Zhang: Lao Zhang participated in the 60 meters, and Lao Wang participated in the 100 meters.
Xiao Wang: Lao Li did not participate in the 100 meters, Lao Wang participated in the 60 meters.
Xiao Li: Lao Zhang did not participate in the 60 meters, and Lao Wang participated in the 200 meters.
If their guesses are all half right, which of the following is true?
a.Lao Zhang, Lao Wang and Lao Li competed in the 200m, 100m and 60m respectively.
b.Lao Zhang, Lao Wang and Lao Li competed in the 60m, 200m and 100m respectively.
c.Lao Zhang, Lao Wang and Lao Li competed in the 100m, 60m and 200m respectively.
d.Lao Zhang, Lao Wang and Lao Li competed in the 200m, 60m and 100m respectively.
Analysis] a. Substitution option A: Lao Zhang, Lao Wang and Lao Li will participate in the 200m, 100m and 60m respectively. The first half of the sentence is wrong, and the second half of the sentence is right; Xiao Wang's first half of the sentence is right, and the second half of the sentence is wrong; Xiao Li's first half of the sentence is right, and the second half of the sentence is wrong. If everyone guesses half of the question correctly, A is the correct option. Therefore, the answer to this question is A.
endThe above is what I want to share, I hope it will be helpful to everyone. At the same time, during the preparation process, if you have any questions, you can always ask me, and I will do my best to help everyone.
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