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2014-08-10T10:16:49+03:00
A/2=b/3=c/5=k

a=2k
b=3k
c=5k

(a+b-c)²⁰¹³  =(2k+3k-5k)²⁰¹³=  (5k-5k)²⁰¹³  = 0²⁰¹³ =0
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