2+4+6+8+10+12+```+2n的结果

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2+4+6+8+10+12+```+2n的结果2+4+6+8+10+12+```+2n的结果2+4+6+8+10+12+```+2n的结果2+4+6+8+10+12+```+2n=2n/2(2n+2)

2+4+6+8+10+12+```+2n的结果
2+4+6+8+10+12+```+2n的结果

2+4+6+8+10+12+```+2n的结果
2+4+6+8+10+12+```+2n
=2n/2(2n+2)
=n(2n+2)
=2n^2+2n