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