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