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9•(5+10+15+...+200):41


Răspuns :

9*[5*(1+2+3+...+40)]:41
9*[5*(40*41:2)]:41
9*[5*(20*41)]:41
9*(5*820):41
9*4100:41
36900:41
900
   9*(5+10+15+...+200):41=
=9*
5(1+2+3+...+40):41
=45*
40*41:2:41
=45*1640:2:41
=45*820:41
=45*20
=900
 
  Sper ca te-am ajutat.