How to create an equation of circuit Logic gates or Logic gate circuit of equation

This time I will discuss "how to create an equation of  circuit logic gates". But, for now that I discuss is  AND gate,  OR gate, and NOT gate. For the equation of the circuit can be seen in the red box in each image sequence.

1. 
2. 
3.  
4.  
5.  
6.  
7.  
8.  
9.  
10.  

For NAND gates, NOR gates, XOR gate, and XNOR gate will probably catch up on the other occasion. thanks for your visit