Question

用matlab 求f(x)=x^2-3x+2函数在区间[-10,10]内的最值

Answer 1

syms x

f=x^2-3*x+2;

df=diff(f,x);

x0=eval(solve(df));

x=[-10 x0 10];

y=x.^2-3*x+2;

fmin=min(y)

syms x

f=(2*x^2-3*x+4)/(x^2+2*x+2);

df=diff(f,x);

x0=eval(solve(df));

x=[-1 x0(1) 3];

y=(2*x.^2-3*x+4)./(x.^2+2*x+2);

fmin=min(y)

这是前两个