1×1/2+1×2×1/3+1×2×3×1/4加省略号加1×2×3乘省略号乘以8/9？
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1×1/2+1×2×1/3+1×2×3×1/4加省略号加1×2×3乘省略号乘以8/9
=1/2+2/3+6/4+24/5+120/6+720/7+5040/8+40320/9
=1/2+2/3+3/2+24/5+20+720/7+630+4480
=4480+630+20+2+2/3+24/5+720/7
=5240.32381
=5132
=1/2+2/3+6/4+24/5+120/6+720/7+5040/8+40320/9
=1/2+2/3+3/2+24/5+20+720/7+630+4480
=4480+630+20+2+2/3+24/5+720/7
=5240.32381
=5132
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1×1/2+1×2×1/3+1×2×3×1/4加省略号加1×2×3乘省略号乘以8/9
=1/2+2/3+6/4+24/5+120/6+720/7+5040/8+40320/9
=1/2+2/3+3/2+24/5+20+720/7+630+4480
=4480+630+20+2+2/3+24/5+720/7
=5240.32381
=5132
=1/2+2/3+6/4+24/5+120/6+720/7+5040/8+40320/9
=1/2+2/3+3/2+24/5+20+720/7+630+4480
=4480+630+20+2+2/3+24/5+720/7
=5240.32381
=5132
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1×1/2+1×2×1/3+1×2×3×1/4加省略号加1×2×3乘省略号乘以8/9
=1/2+2/3+6/4+24/5+120/6+720/7+5040/8+40320/9
=1/2+2/3+3/2+24/5+20+720/7+630+4480
=4480+630+20+2+2/3+24/5+720/7
=5240.32381
=5132
=1/2+2/3+6/4+24/5+120/6+720/7+5040/8+40320/9
=1/2+2/3+3/2+24/5+20+720/7+630+4480
=4480+630+20+2+2/3+24/5+720/7
=5240.32381
=5132
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1×1/2+1×2×1/3+1×2×3×1/4加省略号加1×2×3乘省略号乘以8/9
=1/2+2/3+6/4+24/5+120/6+720/7+5040/8+40320/9
=1+1/6+1+1/2+4+1/5+20+102+6/7+630+4480
=5238+(1/6+1/2+1/5+6/7)
=5238+(2/3+37/35)
=5238+181/105
=5239又76/105
=1/2+2/3+6/4+24/5+120/6+720/7+5040/8+40320/9
=1+1/6+1+1/2+4+1/5+20+102+6/7+630+4480
=5238+(1/6+1/2+1/5+6/7)
=5238+(2/3+37/35)
=5238+181/105
=5239又76/105
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