pouvez-vous m’aider pour le premier exercice svp le plus rapidement possible merci !

Explications étape par étape:

1)A=(1-5t)-(9t-5)

1)A=(1-5t)-(9t-5)=1-5t-9t+5

1)A=(1-5t)-(9t-5)=1-5t-9t+5=(1+5)+(-5t-9t)

1)A=(1-5t)-(9t-5)=1-5t-9t+5=(1+5)+(-5t-9t)=6-14t

1)A=(1-5t)-(9t-5)=1-5t-9t+5=(1+5)+(-5t-9t)=6-14tB=15y²(2/3y-1/3)

1)A=(1-5t)-(9t-5)=1-5t-9t+5=(1+5)+(-5t-9t)=6-14tB=15y²(2/3y-1/3)=15y²×2y-1/3

1)A=(1-5t)-(9t-5)=1-5t-9t+5=(1+5)+(-5t-9t)=6-14tB=15y²(2/3y-1/3)=15y²×2y-1/3=5y²(2y-1)

1)A=(1-5t)-(9t-5)=1-5t-9t+5=(1+5)+(-5t-9t)=6-14tB=15y²(2/3y-1/3)=15y²×2y-1/3=5y²(2y-1)C=(x-√3)(x²+√3)

1)A=(1-5t)-(9t-5)=1-5t-9t+5=(1+5)+(-5t-9t)=6-14tB=15y²(2/3y-1/3)=15y²×2y-1/3=5y²(2y-1)C=(x-√3)(x²+√3)=x³+√3x-√3x²-3

"j'espère que tu as compris"