There is a math problem that can't be calculated. There are two numbers 5 and 3. How to add and subtract to make it equal to 4?

There are two measuring cups with capacities of 5 liters and 3 liters respectively. How to weigh 4 liters of water (or something else)?

Fill a 3 liter container with water and pour it into a 5 liter container;

Fill a 3-liter container with water and pour it into a 5-liter container. At this time, the 5-liter container is filled, leaving 65,438+0 liters of water in the 3-liter container;

Empty the 5-liter container and pour 1 liter water from the 3-liter container into the 5-liter container;

Fill a 3-liter container with water and pour it into a 5-liter container. At this time, there is 1+3=4 liters of water in the 5-liter container.

The formula is: 3+3-5+3=4.

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