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Ответ

Ответ дан
alinkrivenko2005

-x^2 + 10x^2+1=9x^2+1 - сумма

-x^2-(10x^2+1)=-11x^2-1 - разность

-x^×(10x^2+1)=-10x^4-x^2

ab^2-abc+ac^2-acb-ab^2+3abc-ac^2 = abc

( подобные уничтожь сама)

2a^2-5a+7+(-2a^2+5a-2)=5

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