1/24+1/120+1/360+1/840+1/630=?

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1/24+1/120+1/360+1/840+1/630=?

1/24+1/120+1/360+1/840+1/630=?
1/24+1/120+1/360+1/840+1/630=?

1/24+1/120+1/360+1/840+1/630=?
1/18

1/18

1/18

是需要过程的:
70/1680+14/1680+1/360+2/1680+1/630
=86/1680+1/360+1/630
=43/840+1/360+1/630
=129/2520+7/2520+4/2520
=140/2520
=1/18

1/18

70/1680+14/1680+1/360+2/1680+1/630
=86/1680+1/360+1/630
=43/840+1/360+1/630
=129/2520+7/2520+4/2520
=140/2520
=1/18

35/840+1/840+1/360+3/360+1/630
=36/840+4/360+1/630
=3/70+1/90+1/630
=3/70+7/630+1/630
=3/70+8/630
=3/70+4/315
=135/3150+40/3150
=175/3150
=1/18

用计算器