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Mocasin1
a fost răspuns

x+3x+5x+......+99x=2x+4x+........100x-50

Răspuns :

x(1+3+5+....+99)=x(2+4+6+....+100)-50
x(2+4+6+....+100)-x(1+3+5+...+99) = 50
x(2+4+6+....+100 -
  (1+3+5+    + 99 ) = 50

x(1+1+1+....+1) =50 => 50x=50 => x=1

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