Explications étape par étape
A = ( 3/4 + x )²
A = ( 3/4 + x )( 3/4 + x )
A = 9/16 + 0,75x + 0,75x + x²
A = x² + 1,5x + 9/16
B = ( 3x - 2/3 )²
B = ( 3x - 2/3 )( 3x - 2/3 )
B = 9x² - 2x - 2x + 4/9
B = 9x² - 4x + 4/9
C = ( 5/2 x - 1/3 )( 5/2 x + 1/3 )
C = 25/4 x² + 5/6 x - 5/6 x - 1/9
C = 25/4 x² - 1/9
