要过程(第六题),谢谢!
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5/7+5/6+2/7+1/6=(5/7+2/7)+(5/6+1/6)=1+1=2
1/15*(1/3+1/12)=1/15*1/3*(1+1/4)=1/15*1/3*5/4=1/36
(1/4)/(3-5/13-8/13)=(1/4)/[3-(5/13+8/13)]=(1/4)/(3-2)=1/4
(4/9)/[5/6-(1/6+1/3)]=(4/9)/(5/6-1/6-1/3)=(4/9)/(2/3-1/3)=(4/9)/(1/3)=4/3
1/15*(1/3+1/12)=1/15*1/3*(1+1/4)=1/15*1/3*5/4=1/36
(1/4)/(3-5/13-8/13)=(1/4)/[3-(5/13+8/13)]=(1/4)/(3-2)=1/4
(4/9)/[5/6-(1/6+1/3)]=(4/9)/(5/6-1/6-1/3)=(4/9)/(2/3-1/3)=(4/9)/(1/3)=4/3
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