Answer :
from the laws of exponents , we know that ,
am × an = a(m+n)
And , am ÷ an = a(m-n)
So ,we have , (25 ÷ 28) = 2(5-8)= 2-3
Now , 2-3 × 2–7= 2(-3)+(-7)= 2-10
∴ (25 ÷ 28) × 2–7= 2-10 = 
=
∴ (25 ÷ 28) × 2–7 = 
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