Cours: Citer les trois identités remarquables.

Exercice 1: Compléter les égalités :

a) (....+3)2 = (....)2 + 2 x.... x.... +.... 2=49x2 +.... +....

b) (..... -....)2 = (.....)2 - 2x....x.....+.....2=.....-36x + 4

c) (5x-......)2 = (.....)2 - 2x.....x....+....2=.....-40x+...​
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