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2012-11-16T19:46:59+02:00

14+7=21 21/2=10.5 9-3=6 6/2=3 (10.5,6)

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2012-11-16T20:14:23+02:00

(x1+x2)/2

(Y1+Y2)/2

 

-7+14=7/2

3+9=12/2

 

 

(7/2,6)

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