2+4+6+8+10…+100

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2+4+6+8+10…+100
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2+4+6+8+10…+100
2+4+6+8+10…+100

2+4+6+8+10…+100
Sn=n(n+1),n=50,所以结果是2550

=2550

(2+100)*50=2050

2*(1+2+…+50)=2*51*50/2=2550

2+4+6+8+10…+100
=2(1+2+3+4+...+50)
=2*50*(50+1)/2
=50*51
=2550
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2+4+6+8+10…+100
=(2+100)+(4+98)+(6+96)+.......+(48+54)+(50+52)
=102×25
=2550

2550