(2^101-2^100)÷(2^99-2^98)

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(2^101-2^100)÷(2^99-2^98)
(2^101-2^100)÷(2^99-2^98)

(2^101-2^100)÷(2^99-2^98)
=2^100(2-1)/2^98(2-1)
=2^2
=4