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July 2022
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тожества
(х+3)(х-3)-(х-9)(х+1)=8х
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Света19999
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(х+3)(х-3)-(х-9)(х+1)
= x^2 - 9 - (x^2 - 9x +x -9) = x^2 - 9 - x^2 + 9x -x + 9 = 8x - что и требовалось доказать
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(х+3)(х-3)-(х-9)(х+1) = x^2 - 9 - (x^2 - 9x +x -9) = x^2 - 9 - x^2 + 9x -x + 9 = 8x - что и требовалось доказать