75²⁰ = (25 * 3)²⁰ =(5² * 3)²⁰ = 5⁴⁰ * 3²⁰
45¹⁰ * 5³⁰ = (5 * 9)¹⁰ * 5³⁰ = 5¹⁰ * (3²)¹⁰ * 5³⁰ = 5⁴⁰ * 3²⁰
5⁴⁰ * 3²⁰ = 5⁴⁰ * 3²⁰ ⇒ 75²⁰ = 45¹⁰ * 5³⁰
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75²⁰ = (25 * 3)²⁰ =(5² * 3)²⁰ = 5⁴⁰ * 3²⁰
45¹⁰ * 5³⁰ = (5 * 9)¹⁰ * 5³⁰ = 5¹⁰ * (3²)¹⁰ * 5³⁰ = 5⁴⁰ * 3²⁰
5⁴⁰ * 3²⁰ = 5⁴⁰ * 3²⁰ ⇒ 75²⁰ = 45¹⁰ * 5³⁰