Помогите пожалуйста! Заранее спасибо.
1) Вычислите: (8³ : 200 - 0,4²) : (-0,5)²
2) Докажите тождество: 1. 8(2y - 5) - 4(3y - 7) - 6y = -2y - 12. 2. 12 - 6(2z - [tex] \frac{1}{2} [/tex]) + 7z - 15 = -5z.
3) Решите уравнение: [tex] \frac{5}{6} [/tex] ([tex] \frac{1}{3} [/tex]x - [tex] \frac{1}{5} [/tex]) = 3x + 3 [tex] \frac{1}{3} [/tex]
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