简便计算1988-1985+1982-1979+······+8-5+2=

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简便计算1988-1985+1982-1979+······+8-5+2=
x){ɾ/-|n.0F@mkmdkTO>;m$N-X\\& Mcmcm=mc U"&k#qLm @^K{

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