Здравствуйте даю 20 баллов! Найдите суммы и разности многочленов: a)(a^2+3ab+5b^...

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Здравствуйте даю 20 баллов!
Найдите суммы и разности многочленов:
a)(a^2+3ab+5b^2)+(3ab-4a^2-2b^2)
б)(x^3-5x^2-6x-9)-(2x^3-3x^2-4x-10)

Answers & Comments

jhj2015 1)(a^2+3ab+5b^2)+(3ab-4a^2-2b^2)=a^2+3ab+5b^2+3ab-4a^2-2b^2=-3a^2+6ab-3b^2
2)(x^3-5x^2-6x-9)-(2x^3-3x^2-4x-10)=x^3-5x^2-6x-9-2x^3+3x^2+4x+10=-x^3-2x^2-2x-1

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