Bonsoir,

H= 3a+4

I= -8b² +5b

J= -c² -7c -1

K= 2n+1 -4 +5n +3 -9n

= -2n

L= 3-2t -7t  +4 -t² -6 +4t²

= 3t² -9t +1

M=  14d² -2d +11

N= 4x² -3y² +8x -2y

Réponse :

bonsoir

7a-4a+4=3a+4

-10b-5b²+15b-3b²=-8b²+5b

2c-9-c²+8-9c=-c²-7c-1

(2n+1)-4+(5n+3)-9n=2n+1-4+5n+3-9n=-2n

(3-2t)-7t+(4-t²)+(-6-4t²)=3-2t-7t+4-t²-6-4t²=-5t²-9t+1

-8d+11+11d²+6d+3d²=14d²-2d+11

-x-2y+5y²+7x+4x²+2x-8y²=4x²+8x-3y²-2y

Explications étape par étape :