Answer :
we know that, 2-2= 
And 2-3 = 
From the law of exponents , we know that am × an = a(m+n)
∴ 2-2 × 2-3 = 
× 
= 
= 
= 
= 2-5
∴ 2-2 × 2-3 = 2-5
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