1/1*2 +1/2*3 +……+1/9*10
=1-1/2+1/2-1/3+……-1/10
=9/10
1/3*5+1/5*7+……+1/13*15
=1/2 *(1/3-1/5+1/5-1/7+……-1/15)
=7/15
100分闯关期末冲刺5年级数学(上)
100分闯关期末冲刺5年级数学(上)
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=多少?
1/15+1/35+1/63+1/99+1/143+1/195=多少?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=多少?
1/15+1/35+1/63+1/99+1/143+1/195=多少?
数学人气:552 ℃时间:2019-12-01 13:34:02
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