2/2×4+2/4×6+2/6×8＋.+2/98×100
=(1/2-1/4)+(1/4-1/6)+...+(1/96-1/98)+(1/98-1/100)
=1/2-1/100
=49/100
2/2×4+2/4×6+2/6×8＋.+2/98×100
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