计算3x(1x2+2x3+3x4+……+99x100)的值是A97x98x99 B98x99x100 C99x100x101D100x101x102
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计算3x(1x2+2x3+3x4+……+99x100)的值是A97x98x99 B98x99x100 C99x100x101D100x101x102
计算3x(1x2+2x3+3x4+……+99x100)的值是A97x98x99 B98x99x100 C99x100x101D100x101x102
计算3x(1x2+2x3+3x4+……+99x100)的值是A97x98x99 B98x99x100 C99x100x101D100x101x102
1x2+2x3+3x4+…+n(n+1)=1x(1+1)+2x(2+1)+3x(3+1)+…n(n+1)=(1^2+2^2+3^2+…+n^2)+(1+2+3+…+n)=n(n+1)(2n+1)/6+n(n+1)/2=n(n+1)[(2n+1)+3]/6
3x(1x2+2x3+3x4+……+99x100)=3X99X100X202/6=99x100x101
选C
计算3x(1x2+2x3+3x4+……+99x100)的值是A97x98x99 B98x99x100 C99x100x101D100x101x102
计算1x2+2x3+3x4+……+99x100=?
1+x+x2+x3+x4=0,那1+x+x2+x3+x4+……+x2004=?注意:2 3 4 2004都表示 方 .
1X2+2x3+3x4+……+2013x2014
因式分解x4+x3+2x2-x+3
1x2+2x3+3x4=3分2x(3x4)+3分3x(3x4)=3分3x4x5规律计算2008x2009分之1x(1x2+2x3+3x4+.+2008x2009)
运筹学……对偶问题.maxz=x1+2x2+3x3+4x4-x1+x2-x3-3x4=56x1-7x2+3x3-5x4
计算:1/1x2+1/2x3+1/3x4+1/4x5+……1/39x40
计算:1/1X2+1/2X3+1/3X4……1/n(n+1)=?
计算1X2分之1+2X3分之1+3X4分之1+ …+2013X2014分之1
关于数学计算(按规律)1X2=3/1 X1X2X31X2+2X3=3/1 X2X3X41X2+2X3+3X4=3/1 X3X4X51X2+2X3+3X4+4X5=3/1 X4X5X6……(1)用带N的式子表示你发现的规律;(2)计算:1X2+2X3+3X4+……+100X(100+1).
求出不等式解集1+x-x3-x4>0 x3-2x2+3
1/1X2+1/2X3+1/3X4+……+1/2012X2013=2012/x,则x=
因式分解:x4+x3+2x2 +x+1
(2x4-5x2-4x+1)-(3x3-5x2-3x)
X2+X+1=0 X4+2X3+4X2+3X+2=?
已知x2-3x+1=0,求x4-6x3+4x2+15x+2
安照上述规律计算2008x2009分之1x(1x2+2x3+3x4+.+2008x2009)