1) mn - 2m² + 3n * (- 4m) + 4m² = mn - 2m² - 12mn + 4m² = 2m² - 11mn
2) 2 + ab² * 12c + 3ac + 4b⁴ + 2ab²c = 2 + 12ab²c + 3ac + 4b⁴ + 2ab²c =
= 4b⁴ + 14ab²c + 3ac +2
1 2m^2-11mn
2) 4b^2+14ab^2c+3ac+2
1) mn - 2m² + 3n * (- 4m) + 4m² = mn - 2m² - 12mn + 4m² = 2m² - 11mn
2) 2 + ab² * 12c + 3ac + 4b⁴ + 2ab²c = 2 + 12ab²c + 3ac + 4b⁴ + 2ab²c =
= 4b⁴ + 14ab²c + 3ac +2
1 2m^2-11mn
2) 4b^2+14ab^2c+3ac+2