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2013-10-23T17:45:46+02:00
A= (8+10:2)*[5* 8 + 20: (  \frac{3}{5} + \frac{7}{5}  )+9 ]
=(8+5)[40+20:(
 \frac{10}{5} )+9]
=13*(40+20:2+9)
=13*(40+10+9)
=13*59
=767