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оченьважнолюди
@оченьважнолюди
July 2022
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(2х-3х)^2+(3х-3)(3х+3)+21х при х=-2 равно 34
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krasnosolnyshkp2ymc9
(2х-3х)²+(3х-3)(3х+3)+21х=
=(-х)²+9х²-9+21х=
=8х²+21х
-9
при х= -2
8(2)²+21(-2)-9=32-42-9=-19
Ответ: -19≠34
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Answers & Comments
=(-х)²+9х²-9+21х=
=8х²+21х-9
при х= -2
8(2)²+21(-2)-9=32-42-9=-19
Ответ: -19≠34