(2+4+6.+2000)-(1+3+5...+1999)
问题描述:
(2+4+6.+2000)-(1+3+5...+1999)
答
(2+4+6.+2000)-(1+3+5...+1999)=(2-1)+(4-3)+.(2000-1999)=1*1000=1000
(2+4+6.+2000)-(1+3+5...+1999)
(2+4+6.+2000)-(1+3+5...+1999)=(2-1)+(4-3)+.(2000-1999)=1*1000=1000