Réponses

2013-11-24T22:10:29+01:00
A = (8y-4)+(-7+12y)= 8y - 4 - 7 + 12y = 20 y - 11 
B = 8y^2-(5+2y^2) = 8y^2 - 5 - 2y^2 = 6y^2 - 5
C= (3y^2+4y-2)-(-y^2+5y-7) = 3 y^2 + 4y -2 + y^2 - 5y +7 = 4 y^2 - y +5
2013-11-24T22:29:23+01:00




A = (8y-4)+(-7+12y)= 8y-4-7+12y= 20y-11
B = 8y^2-(5+2y^2) = 8y²-5-2y²= 6y²-5
C= (3y^2+4y-2)-(-y^2+5y-7)
= 3y²+4y-2+y²-5y+7= 4y²-y+5