(9x² - 2x + 3)+( -5x² + 4x - 8)= 9x² - 2x + 3 -5x² + 4x - 8=
= 4х²+2х -5
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(9x² - 2x + 3)+( -5x² + 4x - 8)= 9x² - 2x + 3 -5x² + 4x - 8=
= 4х²+2х -5