过草地前,1/2
第一次后,1/2+1/2*1/3=2/3
第二次后,2/3+(1-2/3)*(1/3) =7/9
第三次后,7/9+(2/9)*(1/3)=23/27
过草地前,1/2
第一次后,1/2+1/2*1/3=2/3
第二次后,2/3+(1-2/3)*(1/3) =7/9
第三次后,7/9+(2/9)*(1/3)=23/27
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