9. (X + 0,7)^3 = -27 10. ( 2/3x -1/3)^5 = 1/243 11. ( (2/5-3X)^2 = 9/25 12. (2x-1)^10 = 49^5 13. X : 5^2 = (3/5)^2 : 3^2

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