(1-2x)^7,所有项系数的和是-1,奇数项系数的和是?
答案是1093,我总是算不到,
人气：333 ℃ 时间：2020-01-30 14:06:26
解答
他的展开式有8项,数字不实很大
我全部写出来好了
1-7*2x+21*4x^2-35*8x^3+35*16x^4-21*32x^5+7*64x^6-128x^7
所以奇数项系数和就是
1+84+560+448=1093
推荐
猜你喜欢
- 如图,在平面直角坐标系中,A【-3,4】,B【-1,2】,O为原点,求三角形AOB的面积?
- what you don't want is for people to think that they had a period of good glucose control and then they allow their bloo
- 有一种新运算,规定a^b=a*b+a+b,那么5^8等于几?
- I advise that she __ another day.
- 什么词语形容广阔无边的世界?
- 当幸福来敲门The Pursuit of Happiness观后感
- ET shi shen men yi si (bu hao yi si ,zhi you pin yin shu ru .)
- this is tom he is me good ———.
