Sagot :
bonjour
D = ( - 4 x + 5 ) ( - x + 2 )
d = 4 x² - 8 x - 5 x + 10
D = 4 x² - 13 x + 10
A = ( 3 x - 4 ) ( 2 x+ 3 )
A = 6 x² + 9 x - 8 x - 12
A = 6 x² + x - 12
B = ( 3 x - 2 ) ( x + 6 ) + 3 x ( x - 5 )
B = 3 x² + 18 x - 2 x - 12 + 3 x²- 15 x
B = 6 x² + x - 12
Développer puis réduire, si possible les expressions suivantes:
D = (- 4x + 5) x (- x + 2)
-4x x (-x) - 4x x 2 - 5x + 5 x 2
4x(mini 2) - 8x - 5x + 10
= 4x(mini 2) - 13x + 10
A = (3x - 4) x (2x + 3)
3x x 2x + 3x x 3 - 4 x 2x - 4 x 3
6x (mini 2) + 9x - 8x - 12
6x (mini 2) + 9x - 8x - 12
= 6x (mini 2) + x - 12.
B = (3x - 2) x (x + 6) + 3x x (x - 5)
3x (mini 2) + 18x - 2x - 12 + 3x (mini 2) -15x
= 6x (mini 2) + x - 12.