A=5(9y-4)
A=5×9y-5×4
A=45y-20
B=(8x+1)(4x-5)
B=32x^2-36x-5
C=(2a+7)(5a-10)-8(3a+4)
C=10a^2-20a+35a-70-24a-32
C=10a^-9a-102
D=(7-2x)(5-8x)-(3-20x^2)
D=35-56x-10x+16x^2-3+20x^2
D=32-66x+36x^2
D=36x^2-66x+32
E=(2y+4)(5y-1)+(3y+7)(y-2)
E=10y^2-2y+20y-4+3y^2-6y+7y-14
E=13y^2+19y-18
À toi de faire les deux dernièr
