matplotlib画图 import numpy as np import matplotlib.pyplot as plt x1=[20,33,51,79,101,121,132,145,162,182,203,219,232,243,256,270,287,310,325] y1=[49,48,48,48,48,87,106,123,155,191,233,261,278,284,297,307,341,319,341] x2=[31,52,73,92,101,112,126,140,15…