来自陈栋的问题
计算:12+(13+23)+(34+24+14)+(45+35+25+15)+…+(1920+1820+…+120)=______.
计算:12+(13+23)+(34+24+14)+(45+35+25+15)+…+(130+131+…+132)=______.
1回答
2020-09-20 10:05
计算:12+(13+23)+(34+24+14)+(45+35+25+15)+…+(1920+1820+…+120)=______.
计算:12+(13+23)+(34+24+14)+(45+35+25+15)+…+(130+131+…+132)=______.
12