2的99次方减2的98次方 除以 2的101次方减2的100次方 等于?
要过程```````
人气:304 ℃ 时间:2019-08-20 15:54:52
解答
(2^99-2^98)÷(2^101-2^100)
=(2*2^98-2^98)÷(2*2^100-2^100)
=[2^98*(2-1)]÷[2^100*(2-1)]
=2^98/2^100
=2^98/(2^2*2^98)
=1/4
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