(2²+4²+6²+……+2000²)-(1²+3²+5²+……+1999²)
题目
(2²+4²+6²+……+2000²)-(1²+3²+5²+……+1999²)
利用因式分解!
答案
(2²+4²+6²+……+2000²)-(1²+3²+5²+……+1999²)=(2²-1²)+(4²-3²)+(6²-5²)+……+(2000²-1999²)=(2+1)×(2-1)+(4+3)(4-3)...
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
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
最新试题
- 去年夏天我看了很多书 用英语怎么说?
- 求导,x^lnx
- Which animal live in Australia?A.Eagle and Kangaroo.B.Beaver
- 一列火车有24节车厢,每节长15米,车厢之间1米,这列火车共长多少米?
- 小明今年a岁,母亲a+26岁,5年后母子两人年龄的和是( ),母子两人相差( )岁.
- 3、4/3和6与另一个数可以组成一个比例,这个数可能是9( )有几个写几个
- -What made her parents so angry?-_That____ she had failed in the examination.为什么选that
- 过点P(1,2)的直线L被两平行线L1:4x+3y+1=0与L2:4x+3y+6=0截得的线段长|AB|=√2,求直线的方程?
- 1.填空 Is the park a good place ____ [have] a party?Do you know the d____ between the twins?
- The boy rushed into the room with a stick half his height.3Q!
热门考点