2/2x4+2/4x6+2/6x8.2/8x10+2/10x2

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2/2x4+2/4x6+2/6x8.2/8x10+2/10x2
2/2x4+2/4x6+2/6x8.2/8x10+2/10x2

2/2x4+2/4x6+2/6x8.2/8x10+2/10x2
2/2x4+2/4x6+2/6x8.2/8x10+2/10x2
=1/2-1/4+1/4-1/6……+1/8-1/10+1/10
=1/2