计算!(2/61+4/61+6/61+……+60/61)-(1/61+3/61+5/61+……+59/61)

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计算!(2/61+4/61+6/61+……+60/61)-(1/61+3/61+5/61+……+59/61)

(2/61+4/61+6/61+……+60/61)-(1/61+3/61+5/61+……+59/61)
=30/61