Bonjour j ai un problème Réduire à leur plus simple expression A = (2x + 4 ) + ( x +3 ) B = (4x - 4 ) + ( x - 11 ) c = (3a +9 ) - ( a + 2 ) d = (5a - 11 ) - (

Bonjour !

A = (2x + 4 ) + ( x +3 )

= 2x + 4 + x + 3

= (2+1)x + 4+3

= 3x + 7

B = (4x - 4 ) + ( x - 11 )

= 4x - 4 + x - 11

= (4+1)x -4-11

= 5x - 15

c = (3a +9 ) - ( a + 2 )

= 3a + 9 - a - 2

= (3-1)a + 9-2

= 2a + 7

d = (5a - 11 ) - ( a + 12 )

= 5a - 11 - a - 12

= (5-1)a -11-12

= 4a - 23

e = ( x + 3 ) + ( x + 7 ) + ( x + 12)

= x + 3 + x + 7 + x + 12

= (1+1+1)x + 3+7+12

= 3x + 22

f = (3x +9 ) - ( x - 5 ) - ( x - 8 )

= 3x + 9 - x + 5 - x + 8       ( - fois - = +)

= (3-1-1)x + 9+5+8

= x + 22

g = ( 4x - 5 ) - ( x - 2 ) - ( x + 4 )

= 4x - 5 - x + 2 - x - 4

= (4-1-1)x + -5+2-4

= 2x - 7

h = ( 3x + 2y ) - ( x + y ) - ( x - y )

= 3x + 2y - x - y - x + y

= (3-1-1)x + (2-1+1)y

= x + 2y

N'hésite pas si tu as des questions !