bonjour
c ( c - 1 ) = c² -c
c+c+(c-2) + (c-2) = c + c + c - 2 + c - 2 = 4 c - 4
c+(c - 1) + (c - 1) + (c-2) = c + c - 1 + c - 1 + c - 2 = 4 c - 4
4×c-4 = 4 c - 4
2×c+2×(c-2) = 2 c + 2 c - 4 = 4 c - 4
(2c+1)²-4c²-5 = 4 c² + 4 c + 1 - 4 c² - 5 = 4 c - 4
erreur dans la 1ere , ne fait pas 4 c - 4
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bonjour
c ( c - 1 ) = c² -c
c+c+(c-2) + (c-2) = c + c + c - 2 + c - 2 = 4 c - 4
c+(c - 1) + (c - 1) + (c-2) = c + c - 1 + c - 1 + c - 2 = 4 c - 4
4×c-4 = 4 c - 4
2×c+2×(c-2) = 2 c + 2 c - 4 = 4 c - 4
(2c+1)²-4c²-5 = 4 c² + 4 c + 1 - 4 c² - 5 = 4 c - 4
erreur dans la 1ere , ne fait pas 4 c - 4