Упростить выражение: 1) (5x² + 8х - 7) - (2х² - 2х - 12 ) =
2) (2х - 3) - (-2x² + 5х - 81) =
3) (6α² - 3α + 11) - (-3α - α³ + 7) =
4) (14 αβ - 9α² - 36²) - (3α² + 5αβ - 4β²) =
2) (2х - 3) - (-2x² + 5х - 81) =
3) (6α² - 3α + 11) - (-3α - α³ + 7) =
4) (14 αβ - 9α² - 36²) - (3α² + 5αβ - 4β²) =
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