2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和

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2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和2/1X3/1+3/1x4/

2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和
2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和

2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和
原式=(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+……+(1/41-1/42)
=1/2-1/42
=21/42-1/42
=10/21