1/9+1/99+1/999+1/9999 =多少 急啊 越早越好 要过程的！
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1/9+1/99+1/999+1/9999
=0.1111111...+0.0101010101...+0.001001001001...+0.0001000100010001...
=0.122313132214 122313132214 122313132214 122313132214 ...
=0.122313132214 +0.122313132214*10^-12 +0.122313132214*10^-24 +...
=0.122313132214/(1-10^-12)
=122313132214/999999999999 !
=0.1111111...+0.0101010101...+0.001001001001...+0.0001000100010001...
=0.122313132214 122313132214 122313132214 122313132214 ...
=0.122313132214 +0.122313132214*10^-12 +0.122313132214*10^-24 +...
=0.122313132214/(1-10^-12)
=122313132214/999999999999 !
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