\title	{Fórmula de los elementos en 2x2}
\author	{XIAO Gang}
\email	{xiao@unice.fr}
\language{en}
\format	{html}

\integer{a1=random(2..10)*random(-1,1)}
\integer{a2=random(2..10)*random(-1,1)}
\integer{a3=random(2..10)*random(-1,1)}
\integer{a4=random(2..10)*random(-1,1)}
\integer{a5=random(2..10)*random(-1,1)}
\integer{a6=random(2..10)*random(-1,1)}
\function{formula=\a1*i^2+\a2*i*j+\a3*j^2+\a4*i+\a5*j+\a6}
\integer{c11=evalue(\formula,i=1,j=1)}
\integer{c12=evalue(\formula,i=1,j=2)}
\integer{c21=evalue(\formula,i=2,j=1)}
\integer{c22=evalue(\formula,i=2,j=2)}
\text{mat=[\c11,\c12;\c21,\c22]}
\text{ff=htmlmath(\formula)}

\statement{Sea C=(c<sub>ij</sub>) la matriz 2&times;2 cuyos elementos están definidos por
<p><center>
	c<sub>ij</sub> = \ff.
</center> <p>

}
\answer	{C}  {\mat} {type=matrix}