Simplify and express in exponential form: 3−5×10−5×1255−7×6−5 is :
54
55
25
56
3−5 × 10−5 × 1255−7 × 6−5
= 3−5 × (2×5)−5 × 1255−7 × (2×3)−5 ∵(ab)m = am×bm
= 3−5 × (2−5 × 5−5) × 535−7 × (2−5 × 3−5)
= 3−5 × 2−5 × 5−25−7 × 2−5 × 3−5 (∵am × an = am+n)
= 55