2.3

9¹⁰=9⁶×9⁴

(2/3)⁸=(2/3)⁵×(2/3)³

(81,4)⁶=(81,4)⁴×(81,4)²

(-4/11)¹⁵=(-4/11)⁹×(-4/11)⁶

(-20)⁷=(-20)⁴×(-20)³

(5×1/9)⁴⁰=(5×1/9)²⁵×(5×1/9)¹⁵

(-0,09)¹³=(-0,09)⁹×(-0,09)⁴

(-2×5/13)²⁸=(-2×5/13)¹⁵×(-2×5/13)¹³

2.4

y¹¹=y⁶×y⁵

(-d)⁴¹=(-d)²⁰×(-d)²¹

(8,5c)¹⁴=8,5c⁶×8,5c⁸

(-3×2/3x)¹³=(-3×2/3x)⁷×(-3×2/3x)⁶