2/33+4/33+6/33+8/33~~~~~100/33

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2/33+4/33+6/33+8/33~~~~~100/332/33+4/33+6/33+8/33~~~~~100/332/33+4/33+6/33+8/33~~~~~100/332/33+4/33+

2/33+4/33+6/33+8/33~~~~~100/33
2/33+4/33+6/33+8/33~~~~~100/33

2/33+4/33+6/33+8/33~~~~~100/33
2/33+4/33+6/33+8/33~~~~~100/33
=(2+4+6+8+.+100)/33
=[(2+100)*50/2]/33
=50*51/33
=50*17/11
=850/11

答:
2/33+4/33+6/33+8/33+....+100/33
=(2/33)(1+2+3+4+...+50)
=(2/33)(1+50)*50/2
=2550/33
=850/11