975-147-23怎样简便运算?

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975-147-23怎样简便运算?975-147-23怎样简便运算?975-147-23怎样简便运算?975-147-23=975-(147+23)=975-170=805975-(147+23)=9

975-147-23怎样简便运算?
975-147-23怎样简便运算?

975-147-23怎样简便运算?
975-147-23=975-(147+23)=975-170=805

975-(147+23)=

975-147-23=975-(147+23)=975-170=805