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数学
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1/2 × 1/5 + 1/5 × 1/8 + 1/8 × 1/11 + 1/11 × 1/14 + 1/14 × 1/17
人气:129 ℃ 时间:2020-01-23 16:16:43
解答
=1/3×(1/2-1/5+1/5-1/8+1/8-1/11+1/11-1/14+1/14-1/17)
=1/3×(1/2-1/17)
=1/3×(15/34)
=5/34
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20-19+18-17+16-15+14-13+12-11+10-9+8-7+6-5+4-3+2-1
2/5 5/8 8/11 11/14 1 1/17=?
1/2*5+1/5*8+1/8*11+1/11*14+.+1/17*20=?
11/2*5+11/5*8+11/11*14+11/14*17
(1/2)*5+(1/5)*8+(1/8)*11+(1/11)*14+(1/14)*17+(1/17)*20
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