bonsoir
E = 3 n - 2 + 5 n + 8 = 8 n + 6
R = 10 n + 16 - ( 3 n - 2 ) = 10 n + 16 - 3 n + 2 = 7 n + 18
C = ( 3 n - 2 ) ( 2 n - 9 ) = 6 n² - 27 n - 4 n + 18 = 6 n² - 31 n + 18
E (10 ) = 80 + 6 = 86
R (10) = 70 + 18 = 88
C ( 10) = 600 - 310 + 18 = 308
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bonsoir
E = 3 n - 2 + 5 n + 8 = 8 n + 6
R = 10 n + 16 - ( 3 n - 2 ) = 10 n + 16 - 3 n + 2 = 7 n + 18
C = ( 3 n - 2 ) ( 2 n - 9 ) = 6 n² - 27 n - 4 n + 18 = 6 n² - 31 n + 18
E (10 ) = 80 + 6 = 86
R (10) = 70 + 18 = 88
C ( 10) = 600 - 310 + 18 = 308