Sagot :
Bonjour
A = x + 2
A = 2/3 + 2
A = 2/3 + (2 * 3) / (1 * 3)
A = 2/3 + 6/3
A = 8/3
B = 2x - 3
B = 2 * 2/3 - 3
B = 4/3 - 3
B = 4/3 - (3 * 3) / (1 * 3)
B = 4/3 - 9/3
B = - 5/3
C = 4 (1 - x)
C = 4 (1 - 2/3)
C = 4 [(1 * 3) / (1 * 3) - 2/3]
C = 4 (3/3 - 2/3)
C = 4 * 1/3
C = 4/3
D = x² - 4x + 1
D = (2/3)² - 4 * 2/3 + 1
D = 2²/3² - 8/3 + 1
D = 4/9 - 8/3 + 1
D = 4/9 - 24/9 + 9/9
D = 13/9 - 24/9
D = - 11/9.
Réponse :
bonjour
il suffit de remplacer x
A = 2/3 + 2 = 2/3 + 6/3 = 8 /3
C = 4 ( 1 - 2 /3 ) = 4 ( 3/3 - 2/3) = 4 * 1/3 = 4 /3
B = 2*2/3 - 3 = 4/3 - 9/3 = - 5/3
D = ( 2/3)² - 4 *2/3 + 1 = 4/9 - 8/3 + 1 = 4/9 - 24/9 + 9/9 = - 11/9
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