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一道计算题4/3+16/15+36/35+64/63+100/99+144/143+196/195
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一道计算题
4/3+16/15+36/35+64/63+100/99+144/143+196/195
4/3+16/15+36/35+64/63+100/99+144/143+196/195
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答案和解析
4/3+16/15+36/35+64/63+100/99+144/143+196/195
=7+1/2*(1-1/3+1/3-1/5+1/5-1/7+...+1/13-1/15)
=7+(1/2)*(14/15)
=112/15
=7+1/2*(1-1/3+1/3-1/5+1/5-1/7+...+1/13-1/15)
=7+(1/2)*(14/15)
=112/15
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