№171
1) = -1⁹⁻⁷=-1²
2) = -1⁸⁻⁷=-1¹
3) = = 6⁶⁻⁷=6⁻¹
4) = 6¹³⁻⁵=6⁸
№172
1) x : 3² = 3³
x = 3³ : 3²
x = 1¹
2) x : 2⁴ = 2²
x = 2⁴ : 2²
x = 1²
3) x * 2⁶ = 2⁸
x = 2⁸ * 2⁶
x = 2¹⁴
4) x * 3⁵ = 3⁸
x = 3⁸ * 3⁵
x = 9¹³