12+8-4=16, (6x7):3=14, 1/2 + 1/4 = 3/4, 25% от 80 =20, 2³ × 2² = 2⁵, 5² + √9 = 28, f(x) = x² - 1, -3 ≤ y < 7, △ABC ≅ △DEF, AB ⊥ CD, ∠A = 45°.

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