Bonjour, A = (2/3)(3x+1)^2 B = (6x-3/2)(6/5x+4) C = (7/5x+4/3)^2

A = (2/3) (3x + 1)²

A = 2/3 × (3x² + 2 × 3x × 1 + 1²)

A = 2/3 × (3x² + 6x + 1)

A = 6/3x² + 12/3x + 2/3

A = 2x² + 4x + 2/3

B = (6x - 3/2) (6/5x + 4)

B = 36/5x + 24x - 18/10x + 12/2

B = 7,2x + 24x - 1,8x + 6

B = 35x + 6

C = (7/5x + 4/3)²

C = 7/5² + 2 × 7/5x × 4/3 + 4/3²

C = 49/25 + 46/15x + 16/9

C = 46/15x + 441/225 + 400/225

C = 46/15x + 841/225