Remove the top one and the left one of the first square, remove the bottom two and the right two of the last square, leaving two squares. Remove four matches to make a square, a * * *, and there are three squares.
12 sticks are arranged in a "field" shape, so there are 4 small squares. Move the two sticks on the upper left and the two sticks on the lower right, and place a square at will, which adds up to exactly three squares formed by the remaining sticks. In fact, you only need to move three pieces, such as the arrangement of "pin" fonts.
Extended data:
Form: use "=" to connect equivalent formulas (or numbers expressed in letters).
Equations are divided into equations with unknowns and equations without unknowns.
For example:
X+1= 3-an equation with unknowns;
2+1= 3-an equation without unknowns.
It should be noted that some equations with unknowns have no solutions, but they still have no solutions, such as x+1= x-x.
Baidu Encyclopedia-Equation