题目
解方程:X/1×2+X/2×3+……+X/2007×2008=2007
/(分数线) x(×号) X(就是数学中的X)
/(分数线) x(×号) X(就是数学中的X)
提问时间:2020-07-18
答案
左边=X(1/1×2+1/2×3+……+1/2007×2008)
=X(1-1/2+1/2+1/3+……+1/2007-1/2008)
=X(1-1/2008)
=X(2007/2008)=2007
X=2008
=X(1-1/2+1/2+1/3+……+1/2007-1/2008)
=X(1-1/2008)
=X(2007/2008)=2007
X=2008
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
最新试题
- 1The sitting room is too m___ because it is too small.
- 2下面句子用了什么修辞手法?
- 3解方程组xy=2x+y+2 xz=4x+3z-10 yz=4y+2z-7
- 4What did you see on your way_____?
- 5如图,点C是线段AB的黄金分割点(AC>BC),AC=1,则AB×BC=
- 6观察:2=2=1*2 2+4=6=2*3 2+4+6=12=3*4 2+4+6+8=20=4*5请你根据发现的规律计算:2010+2012+2014+2016+...+2100
- 7中译英
- 8爱迪生的全部发明有哪些
- 92x3-x2-5x+k中,有一个因式为(x-2),则k值为( ) A.2 B.6 C.-6 D.-2
- 10he ,sleep ,like ,the,day,during,to
热门考点
- 1时间状语从句 I had been looking for this kind of herb for two months ___ I found it at last.
- 2you are introducing an english speaker to two of your colliagues.what do you say?
- 3甘油硫酸化灰分检测的是里面的蛋白质吗
- 4这个词有点扯和这句话有点扯用英语怎么说啊
- 5_____ ____ the book? The book is on the table.
- 6The teacher did what he could to help the poor students .是什么从句?
- 7How can l get to the museum?是撒意思?
- 8一个圆的半径是1厘米,半径扩大2倍后,周长是原来的几倍?面积是原来的几倍?
- 9数学分解因式-a^3+a^2-1/4a^2, 好像是利用平方差公式
- 10网申里面的minimum duration和maximum duration是什么意思