简便计算1988-1985+1982-1979+······+8-5+2=

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/13 14:00:52

简便计算1988-1985+1982-1979+······+8-5+2=
简便计算1988-1985+1982-1979+······+8-5+2=

简便计算1988-1985+1982-1979+······+8-5+2=
1988-1985+1982-1979+······+8-5+2
= (1988-1985)+(1982-1979)+······+(8-5)+2
= 3+3+. + 3 + 2
= 3x661 + 2
= 1983+2
= 1985