1/2=1/( )+1/( )+1/

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1/2=1/( )+1/( )+1/( )=1/( )+1/( )+1/( )(提示:先把12拆分成两个单位分数,再把其中一个单位分数进行拆分)

参考答案:

1/2=1/18+1/9+1/3=1/15+1/10+1/3