A = 3 ( 2x - 6 ) - ( 3 - 5x ) B = ( 5 - 2y ) - ( -3y +7) C = 4 ( 6 + z ) + ( z - 3 ) ( 2 - z ) D = ( 2t - 5 ) ( 3t + 2 ) - ( t exposant 2 + 6 )

A = 6x-18-3+5x

A = 11x -21

 

B = 5-2y+3y-7

B = y-2

 

C = 24+4z+(2z-z²-6+3z)

C = 24 +4z +2z -z² -6 +3z

C = -z² +9z +18

 

D = 6t²+4t-15t-10 - t² -6

D = 5t² -11t -16

A= 6x-18-3+5x=11x-21
B=5-2y+3y-7=y-2
C=24+4z+2z-(z^2)-6+3z=(z^2)+10z18
D=(6t^2)+4t-15t-10-t(^2)-6=(5t^2)-11t-16

Z^2= Z puissance 2