1⼀2*4+1⼀4*6+1⼀6*8+…﹢1⼀98*100

2024-12-14 04:09:37
推荐回答(2个)
回答1:

1/2*4+1/4*6+1/6*8+…﹢早亩1/98*100
=(1/2-1/4+1/4-1/6+1/6-1/8+……颂举+1/98-1/100)陆樱森/2
=(1/2-1/100)/2
=49/200

回答2:

1/2*4+1/4*6+1/6*8+…﹢1/98*100
=1/2﹙1/2-1/铅桐颂轮烂4+1/4-1/6+1/6-1/8+······+1/98-1/100﹚
=1/2﹙1/2-1/槐郑100﹚
=1/2×49/100
=49/200