Question

Разложите на множетели a^3+1/8y^3

81y^4-x^4

Answer 1

1)a^3+1/8y^3= (a+1/2y)(a^2-1/2ay+1/4y^2);
2)81y^4-x^4= (9y^2-x^2)(9y^2+x^2)= (3y-x)(3y+x)(9y^2+x^2).