помогите
1) (t² + 8t - 9) - (t² - 11t + 10) = 18t - 20 (уравнение)
2) -0.8c(c + 5) - 0.7(10c+5) + 0.8c² + 10c - 4 =
3) 3x(x - 2) - (3x - 1)(x + 4) ≥ 8(2 -x) (уравнение)
4) (2m⁵n⁴)⁷ * (4m³n⁵)² / (2m⁴n⁴)¹° =
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