求解：已知：x2-x-1=0,x5-5x-1=?

求解：已知：x2-x-1=0,x5-5x-1=? 已知：x2+4x-1=0,求x5+ 1/x5的值.已知：x²+4x-1=0,求x5+ 1/x5的值. 已知x2-3x+1=0,则x5+1/x5的值为多少 已知X2-X-1=0求,X5-X4-3X3+3X2+X的值 求解一个方程急 X（1次方）+X2+X3=5 X2+X3+X4=1 X3+X4+X5=-5 X4+X5+X1=-3 X5+X1+X2=2 求X的值, 已知x2-x-1=0,则x4+2x+1/x5的值为? 已知：X5+X4+X3+X2+X+1=0,求X2008+X2007+X2006+.+X809=? 已知x5+x4+x3+x2+x+1=0,求x2013的值 已知x²-x-1=0求x5-x4-3x3+3x2+x的值 已知x=1/√3+√2.求证:x5+x4-10x3-10x2+x+1=0 已知x=（根号5-1）/2,则x+x2+x3+x4+x5的值等于多少 x1-x2+x3=1x2-x3+x4=21若x1,x2,x3,x4,x5满足方程组 x3-x4+x5=3x4-x5+x1=4x5-x1+x2=5求x2 x3 x4的值2已知 x1+x4+x6+x7=39 x2+x4+x5+x7=49 x3+x5+x6+x7=41 x4+x7=13 x5+x7=14 x6+x7=9 x1+x2+x3+x4+x5+x6+x7=9求x7的值若x1,x2,x3,x4,x5满足方程组 x1-x 7(x-9-5-7)+0x9+1x5+2x7=y6(x-5-2-1)+15x1+14x2+13x5=y 已知X2+X-1=0,用降次代入发求X5次方+X4次方-X3次方+X2+X+1的值 小学四年级数学题(32-x)x5=2x5求解 x5-x4+x3-x2+x-1因式分解 X5-X4+X3+X2+X+1因式分解 已知X=1-根号-3 X5-2X4-2X3+X2-2X-1的值已知X=1-根号3 X^5-2X^4-2X^3+X^2-2X-1的值