计算:2006+2004+2002+2000+1998+1996+1994,等差数列求和.
问题描述:
计算:2006+2004+2002+2000+1998+1996+1994,等差数列求和.
答
2006+2004+2002+2000+1998+1996+1994
=(2006+1994)×7/2
=4000×7/2
=2000×7
=14000