高中常见函数的零点问题程序化.rar_hardj9a_intuitionistic_高中常见指数与二次函数组合后的零点问题

clear all x=-1:0.1:4;%%讨论y=e^x-m*x^2零点的情况 y=zeros(length(x),1);%%m>e/2 1零根 y1=exp(x)-3*x.^2; plot(x,y1) hold on plot(x,y,'r') hold on x1=-8:0.1:8; y1=zeros(length(x1),1); plot(y1,x1,'r-') title('m的值大于等于e/2零点情况') %} %{ %单独原函数m小于e/2 x=-3:0.1:2; y=zeros(length(x),1); y1=exp(x)-(1/2)*x.^2; plot(x,y1) hold on plot(x,y,'r') hold on x1=-8:0.1:8; y1=zeros(length(x1),1); plot(y1,x1,'r-') title('m的值小于等于e/2零点情况') %} %% %{ %小于e/2 两个函数都出现 x=-2:0.1:2; y=(1/2)*x.^2; y1=exp(x); y3=zeros(length(x),1); plot(x,y3,'r-') hold on plot(x,y1,'black-') hold on plot(x,y,'b-') hold on x1=-8:0.1:8; y1=zeros(length(x1),1); plot(y1,x1,'r-') title('m的值小于等于e/2零点情况') %}