X^3 + 2x^2 + x + 3 | 2x^2 - 3x - 4
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x^3 - 1.5x^2 - 2x 0.5x + 1.75 ----------частное
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3.5x^2 + 3x + 3
3.5x^2 - 5.25x - 7
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8.25x + 10 -------------остаток
ПРОВЕРКА:
(2x^2 - 3x - 4)*(0.5x + 1.75) + 8.25x + 10 =
= x^3 + 3.5x^2 - 1.5x^2 - 5.25x - 2x - 7 + 8.25x + 10 = x^3 + 2x^2 + x + 3