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A/2 - 1/2 and please explain!!
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A/2 - 1/2 and please explain!!

User Andrei V
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1 Answer

6 votes

We need to know that:


(a)/(b)-(c)/(d)=(a.d-b.c)/(b.d)


(a)/(2)-(1)/(2)=(a.2-2.1)/(2.2)=(2a-2)/(4)=(a-1)/(2)

User Ludo Schmidt
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