bonjour
6,8 (5 - 3y )² -2,7 ( 8y - 12)
= 6 .8 ( 25 - 30 y + 9 y² ) - 21.6 y + 32.4
= 170 - 204 y + 61.2 y² - 21.6 y + 32.4
= 61.2 y² - 225.6 y + 202.4
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bonjour
6,8 (5 - 3y )² -2,7 ( 8y - 12)
= 6 .8 ( 25 - 30 y + 9 y² ) - 21.6 y + 32.4
= 170 - 204 y + 61.2 y² - 21.6 y + 32.4
= 61.2 y² - 225.6 y + 202.4