根据1/2=1/3+1/6,1/3=1/4+1/12填空
1/4=1/()+1/()1/6=1/()+1/()1/5=1/()+1/()1/7=1/()+1/()...
1/4=1/()+1/()
1/6=1/()+1/()
1/5=1/()+1/()
1/7=1/()+1/() 展开
1/6=1/()+1/()
1/5=1/()+1/()
1/7=1/()+1/() 展开
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