【单选题】
网考网参考答案:C
网考网解析:
72 2 is the same thing as (8×9) 2 , which is the same as (2 2 ×3 2 ) 2 , which is the same as (2 6 )(3 4 ); consequently, everything factors out of the fraction except 5 2 , which equals 25.
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