2/15+2/35+2/63+2/99+2/143
=2/3x5+2/5x7+2/7x9+2/9x11+2/11x13
=1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13
=1/3-1/13
=10/39
2/15+2/35+2/63+2/99+2/143
1个回答
相关问题
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2/3+2/15+2/35+2/63+2/99+2/143=?
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15/2+35/2+63/2+99/2+143/2的过程
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2/35+2/63+2/99+2/143=?
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2/5+2/35+2/63+2/99+2/143+2/193=?/?
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1/3-2/15+3/35-4/63+5/99-6/143
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8/3^2+16/15^2+24/35^2+32/63^2+40/99^2+48/143^2等于多少
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为什么?1/3,-2/15,3/35,-4/63 ( 5/99),(-6/143 )
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1-(2/15+2/35+2/63+2/99)
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3Q,怎么简便2/3+2/15+2/35+2/63+2/99+2/143+2/195+2/255+2/323+2/399
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3/2+15/2+35/2+63/2+99/2=?