1, the definition of definite integral in advanced mathematics is based on the rectangular method. The curved trapezoid is divided into several curved trapezoids, and then a narrow rectangle is used to replace the narrow curved trapezoid, thus the approximate value of definite integral is obtained.

2, this training with f(x)=x? For example, find its integral in the interval [X 1, X2]. Of course, X 1 and X2 input by the integrator should be four-digit binary numbers.