1/3-2/15+3/35-4/63+5/99-6/143=?
1/3-2/15+3/35-4/63+5/99-6/143=?
数学人气:453 ℃时间:2020-03-22 17:49:38
优质解答
1/3-2/15+3/35-4/63+5/99-6/143=1/3-2(1/3-1/5)+3(1/5-1/7)-4(1/7-1/9)+5(1/9-1/11)-6(1/11-1/13)=1/3-2/3+2/5+3/5-3/7-4/7+4/9+5/9-5/11-6/11+6/13=(1/3-2/3)+(2/5+3/5)-(3/7+4/7)+(4/9+5/9)-(5...
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