Решите за 50 баллов !!!!

1) m^3+125n^3=(m+5n)(m^2–5mn+25n^2)2) xy^2–16x^3=x(y^2–16x^2)=x(y–4x)(y+4x)3) 81c^2–d^2+9c+4=81c^2+9c–(d^2–4)=9c(9c+1)–(d–2)(d+2)4) 25–m^2–12mn–36n^2=25–(m^2+12mn+36n^2)=5^2–(m+6n)^2==(5–m–6n)(5+m+6n)