比一比算一算54-18-2=54-()=()怎么算
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解：依题意得算式，54-18-2
=54-（18+2）
=54-20
=34
即54-18-2=34
54-18-2=54-(20)=(32)
54-18-2=54-(20)=(34)
20 34
54-18-2=54-(20)= (34)
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