1/1×2+2/1×2×3+3/1×2×3×4+……8/1×2×3×……×9 等于多少?
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![1/1×2+2/1×2×3+3/1×2×3×4+……8/1×2×3×……×9 等于多少?](/uploads/image/z/351261-45-1.jpg?t=1%2F1%C3%972%2B2%2F1%C3%972%C3%973%2B3%2F1%C3%972%C3%973%C3%974%2B%E2%80%A6%E2%80%A68%2F1%C3%972%C3%973%C3%97%E2%80%A6%E2%80%A6%C3%979+%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F)
1/1×2+2/1×2×3+3/1×2×3×4+……8/1×2×3×……×9 等于多少?
1/1×2+2/1×2×3+3/1×2×3×4+……8/1×2×3×……×9 等于多少?
1/1×2+2/1×2×3+3/1×2×3×4+……8/1×2×3×……×9 等于多少?
=(1/2+1/3+~)
=5/6+3/1*2*3*4+4/~
=23/24+4/~
=362879/362880