Bonjour,
a = 2/3 ; b = - 3/2 ; c = - 3/4
A = 3a - b - c
A = 3 * 2/3 - (- 3/2 - (- 3/4))
A = 6/3 - (- 3/2 + 3/4)
A = 2 - (- 6/4 + 3/4)
A = 2 - (- 3/4)
A = 8/4 + 3/4
A = 11/4
B = 6b² + c
B = 6 * (- 3/2)² + (- 3/4)
B = 6 * (- 3²/2²) - 3/4
B = 6 * 9/4 - 3/4
B = 54/4 - 3/4
B = 51/4
B = 12,75.
C = (a + c) / (a - b)
C = (2/3 - 3/4) / (2/3 - (- 3/2))
C = (8/12 - 9/12) / (4/6 + 9/6)
C = - 1/12 : 13/6
C = - 1/12 x 6/13
C = - 6/156
C = - 1/26.
