(2+4+6+8+10.+100)-(1+3+5+7+9.+99)怎样解答
问题描述:
(2+4+6+8+10.+100)-(1+3+5+7+9.+99)怎样解答
答
(2+4+6+8+10.+100)-(1+3+5+7+9.+99)
=(2-1)+(4-3)+...+(100-99)
=1+1+..+1(共计50个)
=50