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cum se rezolva: 4+6+8+10+..........+202


Răspuns :

4+6+8+10+...+202=
2x2+2x3+2x4+2x5+...+2x101=
2x( 2+3+4+5+...+101)=
2x101x102:2-2=
202x102:2-2=
 20.604:2-2=
 10.302-2=10.300