There is a pig weighing 400 Jin and a bridge bearing 200 Jin. How can a pig cross the bridge?

Put a steel plate with a much larger surface area on the bridge, and then let the pigs walk over. Steel plates can disperse the pig's gravity to the ground on both sides and reduce the stress on the bridge.

PS: the restrictions are not enough. In fact, there are other ways:

1, reinforce the bridge, and increase the bearing capacity of the bridge to 400 kg.

You can go there by boat (by boat instead of swimming).

3. Dig a tunnel from the bottom of the river.

4, teleport.

The bridge is very small, the pig has two hooves on the deck and two hooves on the ground, so you can cross it at any time.

6. You can hang a steel wire on the bridge to hang some pigs, so that the steel wire can bear 200 kilograms of force (this is also walking, not flying).

Introduction:

1, graphic method: with the help of intuitive graphics to determine the direction of thinking, find ideas, and find ways to solve problems. Graphic method is intuitive and reliable, easy to analyze the relationship between numbers and shapes, not limited by logical deduction, flexible and open-minded. However, the graphic method depends on the reliability of human processing and arrangement of representations. Once the graphic method is inconsistent with the actual situation, it is easy to make the association and imagination on this basis appear fallacy or go into misunderstanding, which will eventually lead to wrong results.

2. Physical demonstration method: demonstrate the conditions and problems of mathematical problems with the physical objects around you, as well as the relationship between conditions and conditions, and on this basis, analyze and think, and seek solutions to problems. This method can visualize the content of mathematics and concretize the quantitative relationship.

For example: the problem of meeting in mathematics. Through physical demonstration, we can not only solve the terms of "simultaneity, relativity and encounter", but also point out the thinking direction for students. Another example is the problem of planting trees around a round (square) pond If you can do an actual operation, the effect will be much better