Bonjour pouvez vous m'aider a calculer ces expressions et a démontrer qu'elles sont egales
c×(c-1)

c+c+(c-2) + (c-2)

c+(c - 1) + (c - 1) + (c-2)

4×c-4

2×c+2×(c-2)

(2c+1)²-4c²-5

Merci beaucoup.​
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