3x 3大于等于2x 7,

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(2X2)/1X3+(4X4)/(3X5)+(6X6)/(5X7)+...+(20X20)/(19X21)==?

原式=4/3+16/15+36/35+...+400/399=1/3+1/15+1/35+...+1/399+10=1/3+【(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+...+(1/

SIN(X)=X-X3/3!+X5/5!-X7/7!+.X3代表3次方,/代表除法 用C编程啊,

这是sin(x)的Taylor展开,对哪个编程?再问:wintc吧简单点尽量用数组谢谢

编程求解x-x3/3*1+x5/5*2!-x7/7*3!.,x由键盘输入知道某一项小于十的五次方.

好像每一项的分子是X的奇次方吧,即第1项是X的1次方,即第2项是X的3次方,第3项是X的5次方……另外阶乘积是在分子上还是在分母中,我是按阶乘积是在分母中写的程序,但如果阶乘积是在分子上就将t=p/(

2/1X3+2/3X5+2/5x7+.+2/19x21

等号免啦!我来提醒你:1/(2n-1)(2n+1分解为1/(2n-1)-1/(2n+1)所以结果是:1-1/21=20/21

2/1X3+2/3X5+2/5x7+.+2/19x21全过程(最好带原因),

=2*(1/1*3+1/3*5+.)=2*1/2*(1-1/3+1/3-1/5.+1/19-1/21)=20/21

已知1-1/3=2/1x3,计算1/1x3+1/3x5+1/5x7+1/7x9+1/9x11=

原式=1/2(1-1/3)+1/2(1/3-1/5)+1/2(1/5-1/7)+1/2(1/7-1/9)+1/2(1/9-1/11)=1/2(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9

1/(1x3)+1/(3x5)+1/(5x7)+.+1/(2011x2013) 等于什么

1/(1x3)+1/(3x5)+1/(5x7)+.+1/(2011x2013)=1/2x[2/(1x3)+2/(3x5)+2/(5x7)+.+2/(2011x2013)]=1/2x[1-1/3+1/3

2/1x3+2/3X5+2/5x7=2/7x9+2/9x11

2/1x3+2/3X5+2/5x7+2/7x9+2/9x11=1-1/3+1/3-1/5.+1/9-1/11=1-1/11=10/11

1x2/1+2x3/1+3x4/1+4x5/1+5x6/1+6x7/1

1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7=6/7因为1/1*2=1-1/2同理

(x7+px+q)(x2+2x-3)展开式中不含x2与x3项,求p与q的值

(x7+px+q)(x2+2x-3)=x^9+2x^8-3x^7+px^3+2px^2-3px+qx^2+2qx-3q;不含x^2和x^3;所以p=0;2p+q=0;q=0;如果本题有什么不明白可以追

已知:x1=1/2+1/3,x2=1/3+1/4,x3=x2+x1,x4=x3+x2.,x10=x9+x8,求:x7/x

53/582再问:怎么算的啊?再答:x7=85/6x1+x2.....+x10=971/685/6/971/6=53/582

C语言中把级数y(x)=x+x3/(3*1!)+x5/(5*2!)+x7/(7*3!).表示,不知我的程序哪里出现错误,

-1.#IND00表示代码中有除以0的错误,你令zjz1=0.0;zjz2=0.0;后zjz1,zjz2,不管怎么乘都是0再问:啊,那我应该是让那两个变量等于1就行了吗?再答:理论上可以,但我在vc+

7^4-3x7^2-8x7^3化简

7^4-3x7^2-8x7^3=7^2x(7^2-3-8x7)=7^2x(49-3-56)=49x(-10)=-490(x+y)^2-2(x^2-y^2)+(x-y)^2=(x+y)^2-2(x+y)

1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7

1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)=1-1/7=

编写一个程序,计算x-1/2*x3/4+1/2*3/4*x5/6-1/2*3/4*5/6*x7/8+.的近似值

//#include"stdafx.h"//vc++6.0加上这一行.#include"stdio.h"voidmain(void){doublex,dec,tmp;inti,k;printf("Ty

-13x3/2+3/1x(-13)-0.34x7/2-7/5x0.34用简便方法计算

原式=-13×(2/3+1/3)-0.34×(5/7+2/7)=-13-0.34=-13.34

2/1x3 + 2/3x5 + 2/5x7 +······+ 2/97x99 + 2/99x101 简便计算

99/101再问:过程再答:原式=1-1/3+1/3-1/5+1/5-1/7+……+1/97-1/99+1/99-1/101=1-1/101=100/101不好意思,第一遍口算出错了,是100/101

用数学归纳法证明1/(1x3)+1/(3x5)+1/(5x7)…1/(2n-1)(2n+1)=n/(2n+1)

=k/(2k+1)+1/(2k+1)(2k+3)=(2k+1)(k+1/(2k+3))=(2k+1)((2k方+3k+1)/(2k+3))=1/(2k+1)*((2k+1)(k+1)/(2k+3))=

若x,y,z大于等于0,求证:x3+y3+z3大于等于3xyz

因为x^3+y^3+z^3-3xyz=(x+y)^3-3x^y-3xy^2+z^3-3xyz(把x^3+y^3写成(x+y)^3-3x^2y-3xy^2)=[(x+y)^3+z^3]-(3x^2y+3