Question

Х²(х²-3х+1)-2х(х³-3х²+х) если х = 1целая 1/3

Answer 1

1) упростим выражение:

${x}^{2} ( {x}^{2} - 3x + 1) - 2x( {x}^{3} - 3 {x}^{2} + x) = {x}^{4} - 3 {x}^{3} + {x}^{2} - 2 {x}^{4} + 6 {x}^{3} - 2 {x}^{2} = - {x}^{4} + 3 {x}^{3} - {x}^{2} = - {x}^{2} ( {x}^{2} - 3x + 1)$
2) подставим наше значение х:
$- ({1 \frac{1}{3} )}^{2} \times ( {(1 \frac{1}{3} )}^{2} - 3 \times 1 \frac{1}{3} + 1) = - {( \frac{4}{3} )}^{2} \times ( {( \frac{4}{3} )}^{2} - 3 \times \frac{4}{3} + 1) = - \frac{16}{9} \times ( \frac{16}{9} - 4 + 1) = - \frac{16}{9} \times (1 \frac{7}{9} - 3) = \frac{16}{9} \times ( - 1 \frac{2}{9} ) = - \frac{16 \times 11}{9 \times 9} = - \frac{176}{81} = - 2 \frac{14}{81}$