计算：(2+4+6+8+···+100)-(1+3+5+···+99)
问题描述：
计算：(2+4+6+8+···+100)-(1+3+5+···+99)
答
50
.......
答
(2+4+6+8+···+100)-(1+3+5+···+99)
=(2-1)+(4-3)+...(100-99)
=50
答
(2+4+6+8+···+100)-(1+3+5+···+99)
=( 2+100)x 99 /2 - ( 1+99) x 99/2
= (102 + 100) x 99/2
= 101 x 99
= 9999
答
2-1+4-3+6-5+。。。+100-99
=50