括号里填上合适的自然数①1/4=1/( )+1/( ) ②1/3=1/( )+1/( ) ③1/5=1/( )+1/( )+1/() ④1/12=1/( )+1/( )+1/( ) ⑤3/16=1/()+1/() ⑥8/15=1/()_+1/()

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