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3^18x(-1/9)^8=9^9/(9^8)=9
a<-b<0<-c 所以a+c>0,b-c>0,a+b<0 所以原式=a+c+b-c-a-b+|c-a|=|c-a| 其中由於不知a,c的大小關係所以|c-a|沒法化簡
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