5/8-(1/笑闭2+0.6)×5/11=5/辩升拦8-11/10×5/11=5/8-1/2=1/携胡8(3/4+7/8)×(11/12-5/6)=13/8×1/12=13/962/3×[1/(5/6-0.8)]=2/3×30=20