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b) a^9 ÷a^10 =a^ 9-10 =a^ -1
c) a^15 ÷ a^12 =a^15-12 =a³
d) a^12 ÷ a^10 =a^12-10 =a²
pisałam od razu obliczeniach bez danych przykładów.
b)a¹²:a³/a⁴*a⁶=a¹²⁻³/a⁴⁺⁶=a⁹/a¹⁰=a⁹⁻¹⁰=a⁻¹
c)(a⁵)³/a⁸*a⁴=a¹⁵/a⁸⁺⁴=a¹⁵/a¹²=a¹⁵⁻¹²=a³
d)a¹⁶:a⁴/(a⁵)²=a¹⁶⁻⁴/a¹⁰=a¹²⁻¹⁰=a²