Bonsoir,
A= 2(5+x)
= 2*5 + 2*x
= 10 +2x
B= x(x+4)
= x*x + x*4
= x² + 4x
C= 7(x-3)
= 7*x -7*3
= 7x -21
D= 3x(x+5)
= 3x*x +3x*5
= 3x² +15x
E=6(1+x) -5x
= 6*1 +6*x -5x
= 6 +6x -5x
= 6 +x (1x)
F=8x(2x+1) +2(9-x)
= 8x*2x +8*1 +2*9 -2*x
= 10x² +8 +18 -2x
=10x² +26 -2x
G= 11(7x+5) +4(y-5)
= 11*7x +11*5 +4*y -4*5
= 77x +55 +4y -20
= 77x +4y +35
Exo 2:
H= 5x -5
= 5*x -5*1
= 5(x-1)
I= 6x+6
= 3*2x +3*2
= 3(2x+2)
J=72x+9 ou
= 8x*9 +9*1 3*24x +3*3
= 9(8x+1) 3(24x+3)
K=36x-6y
= 6*6x -6*y
= 6(6x-y)
L=56-7x
= 7*8 -7*x
= 7(8-x)
