Bonjour
♧ Développer :
A = (3x+5/6)²
A = (3x)² + 2×3x×5/6 + (5/6)²
A = 9x² + 5x + 25/36
B = (3/2-a)²
B = (3/2)² - 2×(3/2)×a + a²
B = 9/4 - 3a + a²
C = (x/3+4/5)(x/3-4/5)
C = (x/3)² - (4/5)²
C = x²/9 - 16/25
D = (1/4+2x)²
D = (1/4)² + 2×(1/4)×2x + 2x²
D = 1/16 + x + 4x²
Voilà ^^
