(1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/288)*128
(1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/288)*128
数学人气:114 ℃时间:2019-12-20 07:43:43
优质解答
(1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/288)×128=128×(1/8)[1+1/3+1/6+1/10+1/15+1/21+1/28+1/36] =128×(1/8)[1+2(1/(2×3)+1/(3×4)+1/(4×5)+1/(5×6)+1/(6×7)+1/(7×8)+1/(8×9)] =128×(1/8)[1+2(1/2-1/...
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