Jawabanmu

2014-06-30T11:11:31+07:00
A*b = kuadrat(selisih) dibagi jumlah(kuadrat)
a*b = (a-b)²/(a²+b²)
maka

5*1 = (5-1)²/(25+1)
= 16/26
= 8/13

:)
2014-06-30T11:13:51+07:00
5*1
= (5-1)²/(5² + 1²)
= (4)²/(25+1)
=16/26
= 8/13
semoga membantu