Express the following in exponential form:
(i) 5 × 5 × 5 × 5 × 5
(ii) 4 × 4 × 4 × 5 × 5 × 5
(iii) (-1) × (-1) × (-1) × (-1) × (-1)
(iv) a × a × a × b × c × c × c × d × d
(i) 5 × 5 × 5 × 5 × 5 = (5)5
(ii) 4 × 4 × 4 × 5 × 5 × 5 = 43 × 53
(iii) (-1) × (-1) × (-1) × (-1) × (-1) = (-1)5
(iv) a × a × a × b × c × c × c × d × d = a3b1c3d2