가a/b,나b/a. 나-가=b/a-a/b=9/20 => b제곱/ab-a제곱/ab=9/20 b제곱-a제곱=9,ab=20. 2x10=20,5x4=20이중 5제곱-4제곱=9이므로 b=5,a=4 나=b/a=5/4=1.25
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