input courbescp13; beginfig(1); cadre((-3.5,-3),(4.5,5)); origine((0,0)); unites(1,2); draw grille(0.5) withcolor gris;; draw axes; graduantx.bot; graduanty.lft; draw courbe1(-3,5,2,.5*x) withcolor bleu; draw labelise1(btex $y=f(x)$ etex,0.2); endfig; beginfig(2); cadre((-9,-4),(9,5)); origine((0,0)); unites(3,3); draw grille(0.5) withcolor gris;; draw axes; graduantx.bot; graduanty.lft; draw courbe1(-1,1,2,2*x) withcolor bleu; draw labelise1(btex $y=f(x)$ etex,0.25); draw courbe2(-3,5,2,0.5*x) withcolor bleu; draw labelise2(btex $y=g(x)$ etex,0.2); draw courbe3(-3,5,2,-x/3) withcolor bleu; draw labelise3(btex $y=h(x)$ etex,0.2); endfig; beginfig(3); cadre((0,0),(18,8)); origine((9,4)); unites(4,2); draw grille(0.5) withcolor violet; graduantx.bot; graduanty.lft; drawoptions(withpen pencircle scaled1.5bp); draw axes; draw courbe1(-9,9,100,1.5*x); draw courbe2(0,3,100,2-x); draw courbe3(-9,9,100,-2+2*x); draw courbe4(-9,9,100,x**2-2*x-1); draw courbe5(-9,9,100,-0.75*x); draw courbe6(-3,3,100,0.25*x-1); draw labelise1(btex courbe 1 etex,0.44); draw labelise2(btex courbe 2 etex,0.1); draw labelise3(btex courbe 3 etex,0.6); draw labelise4(btex courbe 4 etex,0.45); draw labelise5(btex courbe 5 etex,0.4); draw labelise6(btex courbe 6 etex,0.225); endfig; end