4 cours d'équation du second degré f1:x↦2x2+3x+1{\displaystyle f_{1}:x\mapsto 2x^{2}+3x+1\,}
f2:x↦x2−2x+2{\displaystyle f_{2}:x\mapsto x^{2}-2x+2\,}
f3:x↦−x2+3{\displaystyle f_{3}:x\mapsto -x^{2}+3\,}
f4:x↦−3x2−x{\displaystyle f_{4}:x\mapsto -3x^{2}-x\,}
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Crochet.david (talk)