1) (−2m²+3n+6mn²)−(2mn²+3n+m²) = −2m²+3n+6mn² - 2mn²-3n-m² =
= -3m²+4mn²;
2) (−4cd−c³+d²)+(2c³−d²) = −4cd−c³+d² + 2c³−d² =
= -4cd+c³.
