计算:(121+122+……+180)_(41+42+……+100)=( )计算:(121+122+……+180)_(41+42+……+100)=( ).

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/29 12:43:03
计算:(121+122+……+180)_(41+42+……+100)=( )计算:(121+122+……+180)_(41+42+……+100)=( ).
x){nuahdmhdaiZhkj 4m54ѣgTOmdkԳ/{鋽kL{1 tnl jj Ž

计算:(121+122+……+180)_(41+42+……+100)=( )计算:(121+122+……+180)_(41+42+……+100)=( ).
计算:(121+122+……+180)_(41+42+……+100)=( )
计算:(121+122+……+180)_(41+42+……+100)=( ).

计算:(121+122+……+180)_(41+42+……+100)=( )计算:(121+122+……+180)_(41+42+……+100)=( ).
可以转化成(121+180)×30-(41+100)×30,最后的结果是4800

=[(121+180)(180-120)/2][(41+100)(100-40)/2]
=301x30x141x30
=38196900