Donne les résultats sous forme simplifier A = 7/8 - 3/4 x 20/9 = B= (5/3 - 1/9 ) : (1/2 + 2/3 ) = Développer les expression suivante et les réduire A= ( -2x + 1

Bonjour,

A = 7/8 - 3/4 * 20/9
A = 7/8 - (3 * 20)/(4 * 9)
A = 7/8 - (3 * 4 * 5)/(4 * 3 * 3)
A = 7/8 - 5/3
A = (7 * 3)/(8 * 3) - (5 * 8)/(3 * 8)
A = 21/24 - 40/24
A = -19/24

B = (5/3 - 1/9) ÷ (1/2 + 2/3)
B = (15/9 - 1/9) ÷ (3/6 + 4/6)
B = 14/9 ÷ 7/6
B = 14/9 * 6/7
B = (14 * 6)/(9 * 7)
B = (2 * 7 * 2 * 3)/(3 * 3 * 7)
B = (2 * 2)/3
B = 4/3


A = (-2x + 1)(3y - 2)
A = -2x * 3y - 2x * (-2) + 1 * 3y + 1 * (-2)
A = -6xy + 2x + 3y - 2

B = -4(x - 5)(x + 2)
B = (-4x + 20)(x + 2)
B = -4x² - 8x + 20x + 40
B = -4x² + 12x + 40

bonjour


A = 7/8 - 3/4 x 20/9 
   = 7/8 - 60 /36
   = 63/72 - 120/72
  = - 57/72 = -19/24

B = ( 5/3 - 1/9) : ( 1/2 + 2/3)
   = ( 15/9 - 1/9) : ( 3/6 + 4/6) 
   = 14/9 : 7/6
   = 14/9 * 6/7
   = 84/63 = 4/3

A = - 6 x y + 4 x + 3 y -  2 
   

B = ( - 4 x + 20) ( x + 2) 
   = - 4 x² - 8 x + 20 x + 40
   = - 4 x² + 12 x + 40