Question

⦁ Разложите на множители:
а)  $15a^{2} b^{7} - 20a^{3} b^{3}$
б)$6ab^{5} (x-y) - 15a^{3} b^{2} (y-x)$

Answer 1

$15a^2b^7-20a^3b^3=5a^2b^3(3b^4-4a)\\\\6ab^5(x-y)-15a^3b^2(y-x)=\\=6ab^5(x-y)+15a^3b^2(x-y)=3ab^2(x-y)(2b^3+5a^2)$