Répondre :
A=10(2y+3)+5(7y-4)
A=20y+30+35y-20
A=55y+10
B=9a(6a-4)-(8a+7-5a²)
B=54a²-36a-8a-7+5a²
B=59a²-44a-7
C=3z(6z-5)-7z(8z-12)
C=18z²-15z-56z²+84z
C=-38z²+69z
D=-4t(11t-2)-9t(2t²-5)
D=-44t²+8t-18t³+45t
D=-18t³-44t²+53t
A=20y+30+35y-20
A=55y+10
B=9a(6a-4)-(8a+7-5a²)
B=54a²-36a-8a-7+5a²
B=59a²-44a-7
C=3z(6z-5)-7z(8z-12)
C=18z²-15z-56z²+84z
C=-38z²+69z
D=-4t(11t-2)-9t(2t²-5)
D=-44t²+8t-18t³+45t
D=-18t³-44t²+53t