Ответ:
[tex]18 - (x {}^{2} - 4x + 4) = 4x - x {}^{2} [/tex]
[tex]18 - x {}^{2} + 4x - 4 - 4x + x {}^{2} [/tex]
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Ответ:
[tex]18 - (x {}^{2} - 4x + 4) = 4x - x {}^{2} [/tex]
[tex]18 - x {}^{2} + 4x - 4 - 4x + x {}^{2} [/tex]