(2х – 6)2 + (5х + 3)(5х – 3) + 9х=4x-12+25x^2-9+9x=25x^2+5x-21
Ответ: 25x^2+5x-21
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(2х – 6)2 + (5х + 3)(5х – 3) + 9х=4x-12+25x^2-9+9x=25x^2+5x-21
Ответ: 25x^2+5x-21