C722 is the same thing as (8×9)2, which is the same as (22×32)2, which is the same as (26)(34); consequently, everything factors

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解析 722 is the same thing as (8×9)2, which is the same as (22×32)2, which is the same as (26)(34); consequently, everything factors out of the fraction except 52, which equals 25.
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