Répondre :
a)4*a*7 =28a
d)3n+4*7=3n+28
b)5+6*x*2 =5+12x
e)2*x+7*y=2x+7y
c)8*m+m*m=8m+m²
f)a*a*a+8=a³+8
a) 12*3-2*x =36-2x
c)(a-7) * 9=9a-63
b) x*13*y=13xy
d)(3-8a)( b+5)=(3-8a)(b+5)=3b+15-8ab-40a=-8ab-40a+3b+15
d)3n+4*7=3n+28
b)5+6*x*2 =5+12x
e)2*x+7*y=2x+7y
c)8*m+m*m=8m+m²
f)a*a*a+8=a³+8
a) 12*3-2*x =36-2x
c)(a-7) * 9=9a-63
b) x*13*y=13xy
d)(3-8a)( b+5)=(3-8a)(b+5)=3b+15-8ab-40a=-8ab-40a+3b+15