17e0b68b402e058.jpg，计算函数极值的实验命令为(). A: symsx; f1='sqrt(2*x-x^2)';fplot(f1,[0,2])f2='-sqrt(2*x-x^2)';[f2min,fval]=fminbnd(f2,0,2);f1max=f2minf1max =1.0000 B: symsx; f1='sqrt(2*x-x^2)';fplot(f1,[0,2])[f1min,fval]=fminbnd(f1,0,2);f1min =1.0000

下列创建符号函数命令中,正确的是 A: >>f=tsinx B: >>f=t*sin(x) C: >>symstx;f=t*sin(x) D: >>symsx;f=sym(t*sin(x))

求解x^3+x^2+x+1=0的所有复数根,用matlab命令为symsx;solve(x^3+x^2+x+1,x);用wxMaxima的命令为solve(x^3+x^2+x+1=0)