bonjour
E = ( x - 2 ) ( 2 x + 3 ) - 3 ( x - 2 )
E = ( x - 2 ) ( 2 x + 3 - 3 )
E = 2 x ( x - 2 )
F = x ( x - 2 ) = x² - 2 x
2 ( x² - 2 x ) = 2 x² - 4 x
E = 2 x² - 4 x
donc E = 2 F
270 = 2 * 3 ³ * 5
330 = 2 * 3 * 5 * 11
PGCD = 30
les plaques auront 30 cm de côté
270 / 30 = 9
330 / 30 = 11
11 * 9= 99
il faudra 99 plaques