Question

Помогите плизз
410 б и г

Answer 1

б)
$5a^4-8a^3(a-3)+(a^2+5a)*5a^2=5a^4-8a^4+24a^3+5a^4+25a^3=\=2a^4+49a^3$

г)
$-12.5y+(-y^3+2y^2-5)*(-2.5y)-2.5y*y^3=\=-12.5y+2.5y^4-5y^3+12.5y-2.5y^4=-5y^3$