April 2019 1 76 Report
Jika a . b . c = 1 maka ekspresi.
 \frac{1}{1+a+ b^{-1} } +  \frac{1}{1+b+ c^{-1} } +  \frac{1}{1+c+ a^{-1} }
sama dengan..
a. -1
b. 1
c.  \frac{1}{a.b} }
d.  \frac{1}{b.c} }
e.  \frac{1}{c.a} }

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