(1-1/2x2)(1-1/4x4)(1-1/2001x2001)求简便运算
已知m,n互为相反数,a,b互为倒数,x的绝对值等于3,求x3-(1+m+n+ab)x2+(m+n)x2001+(-ab
1+2x4-(x2+2x3)
x2(2表示平方)-5x+1=0,求x4+x4分之一(4表示4次方)的值?
已知x2+2x-1=0,求下列式子的值:(1)x-1/x (2)x2+1/x2 (3)x4+1/x4
设线性方程组(x1+2x2-2x3+2x4=2,x2-x3-x4=1 x1+x2-x3+3x4=a)
已知 X / (X2+X+1) =a,求 X2/(X4+X2+1)=? .说明:X2为X平方,X4为X四次方.非常感谢
已知x2+x+1=0 求x4+1/x4
一道简便计算数学题1X2+2X3+3X4+4X5...+n(n+1)一1X2+2X3+3X4+4X5...+2013X2
1x2分之2010+2x3分之2010+3x4分之2010+4x5分之2010+5x6分之2010简便运算
若X2+1除以X=5,求X4+X2+1除以X4-X2+1
1x2+2x4+3x6+4x8+5x10+.+20x40 简便计算
(4.4x7.5x4.8)除以91.5x2.5x2.4)简便运算