我使用循环得到m{149}和PP{150,149}关于a的函数表达式,然后在它们等于30时侯的根,但运行太慢,有没有什么好的解决办法 clear clc x=[0,0.0810795702470861,0.338893857750972,0.289608984180225,0.373884785059033,0.419305386647289,0.381255405793147,0.387805825669320,0.473950108456370,0.777482062955663,0...