379-297=怎样简便运算
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379-297=怎样简便运算
379-297=怎样简便运算
379-297=怎样简便运算
=379-(300-3)
=379-300+3
=79+3
=82
=379-(300-3)
=379-300+3
=79+3
=82
379-297=(300+79)-297=300-297+79=3+79=82
379-297=379-(300-3)=379-300+3=79+3=82
379-297=(379+3)-(297+3)=382-300=82
379-297=(370+9)-(290+7)=(370-290)+(9-7)=80+2=82