100X100—99X99+98X98+...+2X2—1X1
已知x4+x3+x2+x+1=0,求x100+x99+x98+x97+x96的值.
1/1x2+1/2x3+1/3x4+1/4x5+.+1/98x99+1/99x100
1/1X2+1/2x3+1/3x4+1/4x5+.+1/98x99+1/99x100求结果!
2/1x2+2/2x3+2/3x4+2/4x5+...+2/98x99+2/99x100
求1x2,2x3,3x4,4x5,……98x99,99x100的倒数和
56X99+56 37X29+37+37X70 99X99+99 16X98+32 37X15+37X10X6+37X2
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
1X2分之1十2X3分之1十3X4分之1…十98X99分之1十99X100分之1=().求答案和规律
1x2x3x4x.x100+1x2x3x4x.x99+.+1x2x3+1x2+1的个位数是多少?
1分之1x2+1分之2x3+1分之3x4.+1分之99x100
计算1x2+2x3+3x4+4x5+...+99x100
(1-1/2x2)(1-1/3x3).(1-1/100x100)