1.Разложите на множители
1)a^3+8b^3 2)x^2y-36y^3
3)-5m^2+10mn-5n^2
4)4ab-28b+8a-56
5)a^4-81
2.Упростите выражение
a(a+2)(a-2)-(a-3)(a^2+3a+9)
3.Разложите на множители
1)x-3y+x^2-9y^2
2)9m^2+6mn+n^2-25
3)ab^5-b^5-ab^3+b^3
4)1-x^2+10xy-25y^2
P.S.A во второй степени-a^2 и т.д.
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