在(1+x)5(1-x)4的展開式中,x3的系數(shù)為
在(1+x)5(1-x)4的展開式中,x3的系數(shù)為
數(shù)學(xué)人氣:551 ℃時間:2020-04-12 04:44:30
優(yōu)質(zhì)解答
因為(1+x)^5*(1-x)^4=[(1+x)(1-x)]^4*(1+x)=(1-x^2)^4*(1+x)=[(1-x^2)^2]^2*(1+x)=(1-2x^2+x^4)^2*(1+x)=(1+4x^4+x^8-4x^2+2x^4-4x^6)*(1+x)=(x^8-4x^6+6x^4-4x^2+1)*(x+1)=x^9-4x^7+6x^5-4x^3+x+x^8-4x^6+6x^4-4x^...
我來回答
類似推薦
- 在(1+x)5(1-x)4的展開式中,x3的系數(shù)為
- (x-1)-(x-1)2+(x-1)3-(x-1)4+(x-1)5的展開式中的x3的系數(shù)是_.
- 求(1+x)2(1-x)5的展開式中x3的系數(shù)
- 在(1-x3)*(1-X)^10展開式中,含x^5項的系數(shù)是
- 在(1-x)5+(1-x)6+(1-x)7+(1-x)8的展開式中,含x3的項的系數(shù)是( ?。?A.74 B.121 C.-74 D.-121
- 函數(shù)f(x)=sinx-cosx^2的最小值是?
- 英語翻譯
- I took my grandpa to the hospital this morning,_____ I missed the first class.
- So crazy
- 方差是各個數(shù)據(jù)與平均數(shù)之差的平方的平均數(shù)
- 函數(shù)y=f(x)與它反函數(shù)y=f^-1(x)怎么讀?
- These are photos of my families.Look at them 改錯
猜你喜歡
- 1平面與平面重合,是否屬于平行一類?那重合的兩直線,也屬于平行一類的嗎?
- 2非洲每年因饑餓死亡的人數(shù)及現(xiàn)在饑餓人口數(shù)量拜托各位了 3Q
- 3decide to do sth.還=什么
- 4(7/8)o you think of london?B:5.____london is one of the liveliest cities
- 5啤酒可以托運嗎
- 6邊長為2√6的等邊三角形的中心到一邊的距離為?
- 7please give your hand to help me
- 8已知2的X次方等于3的Y次方等于6的Z次方不等等于1,證明X分之一加Y分之一等于Z分之一.
- 9幫我做做?
- 10機械分析天平TG628A的使用說明書
- 11in winter ,we wear warm coats to protect our bodies_.
- 12( )was most importance to her ,she told me,was her family it this what as