简便运算:77×98

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简便运算:77×98简便运算:77×98简便运算:77×9877×98=77×(100-2)=77×100-77×2=7700-154=7546(丨00一2)X77

简便运算:77×98
简便运算:77×98

简便运算:77×98
77×98
=77×(100-2)
=77×100-77×2
=7700-154
=7546

(丨00一2)X77