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²⁵/₆₄ - ⁹/₁₂₁ a² = 0
- ⁹/₁₂₁ a² = - ²⁵/₆₄ / (-1)
⁹/₁₂₁ a² = ²⁵/₆₄ / √ całość pierwiastkujemy
³/₁₁ a = ⁵/₄ / * ¹¹/₃
a = ⁵⁵/₁₂
a = 4 ⁷/₁₂
2.
3a²bc - 6ab²c + 30abc²
3abc (a - 2b +10c)