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Автор - andriyrosohatskiy

Решить уравнение: (1+3х)(9х²-3х+1)-3(3х+2)(3х-2)=13

Ответ

Автор - rina2403k

9x {}^{2}   - 3x + 1 + 27x {}^{3 }  - 9x {}^{2}  + 3x - 3(9x {}^{2}  - 4) = 13 \  1 + 27x {}^{3}  - 27x {}^{2}  + 12 = 13  \ 13 + 27x {}^{3}  - 27x {}^{2}  = 13 \ 27x {}^{3}  - 27x {}^{2}  = 0 \ 27x {}^{2} (x - 1) = 0 \ x {}^{2} (x - 1) = 0 \ x {}^{2}  = 0 \ x - 1 = 0 \ x = 0 \ x = 1

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