Joke Collection Website - Mood Talk - Please elaborate on the meaning of the following circuit diagram, especially the triangle with positive and negative poles in the middle. Answer 20 points in detail.

Please elaborate on the meaning of the following circuit diagram, especially the triangle with positive and negative poles in the middle. Answer 20 points in detail.

This is an operational amplifier circuit, the triangle is an integrated operational amplifier,+and-are signal input terminals, and the upper and lower terminals provide power for the internal circuit. The two resistors on the left are voltage divider resistors, which provide appropriate signal voltage. The resistor on the right is a feedback resistor to improve the performance of the amplifier. Capacitance plays the role of coupling and isolating DC, and B is the output end of the signal.