What are the problems, and what are the three characteristics of the problems?

4。How many meters are the length of one bar and one-fifth of a meter shorter than the other?

Don't think about the fractions here, it's okay to think they're decimals. That is, using three-quarters plus one-fifth plus three-quarters equals seventeen tenths, that is, one point seven, which is equivalent to the result being the same.

5.A wire is cut off four-sevenths of it for the first time, four-sevenths of a meter for the second time, and the length of the first wire. ()a, a. bII cI can't confirm it.

It should be a, suppose this wire is one meter, and the first time you cut off four-sevenths, that is, four-sevenths of a meter, at this time there are only three-sevenths of meters left, and you can't take another four-sevenths of a meter, that is, this wire is greater than one meter. Since it is larger than one meter, then four-sevenths larger than one meter must be more than four-sevenths of a meter, I don't know if you can understand this. For example, half of a meter is a meter, and half of a meter is 1 meter, which means that half of a meter is definitely longer than half of a meter.

Then four-sevenths larger than one meter is definitely longer than four-sevenths of a meter. It's a bit winding.

Seven-eighths of a ton of iron is heavier than one-eighth of seven tons of cotton (wrong) Why? Explain it clearly. Some people say right and some people say wrong, is it right or wrong? The answer is wrong.

It must be wrong. It's just as heavy.

I don't know if you've forgotten it. Seven-eighths of a ton is seven-eighths of a ton.

And one-eighth of seven tons is also seven-eighths of tons, and the two weights are the same.

It's like saying that 3 tons is heavier than 3 tons, are you right or wrong?

The first three are not bai, the information is incomplete, du fourth and first.

Needless to say, the fifth question chooses daoa, the reason is like this, first of all, we don't know the length of the answering steel bar, set it to x, the first time to cut off four-sevenths of it, indicating that the length of the first cut is 4 7x, the remaining 3 7x, the second time to cut off four-sevenths of the meter, indicating that the remaining 3 7x is greater than 4 7 meters, we can calculate that x is greater than 3 4 meters, that is to say, x is greater than 1, this is the premise. The meaning of the title is to compare the length of 4 7x with 4 7, and it is clear that if x is greater than 1 meter, it must be the length of the first interception.

There is a problem with this algorithm, the money owed and the remaining money together have no meaning, it can be understood in this way, put the remaining 10 yuan in your hand, and then pay back 5 yuan per person, so you owe your mother 485 and your father 485, adding it up, it happens to be 970 for leather shoes

The problem has three characteristics: the first stem states a lot of content, but it is confusing; Second, the question asked: Many situations require thinking and reasoning to arrive at an answer; Thirdly, the answers to some difficult questions are not unique, and the answers will be different under what circumstances, and the answerer needs to have a comprehensive understanding of the topic. These are the three characteristics of the puzzle.

One is that it does not appear often, the second is that the topic is circumventing, and the third is that there are few topics but have other meanings.

You're just giving me a problem right now.