x2+3x+1=0求x7+1/x7的值

x2+3x+1=0,求x3+1/x3与x7+1/x7的值. x2+3x+1=0求x7+1/x7的值 高一 数学 数学 请详细解答,谢谢! (1 15:53:45)x2+3x+1=0,求x3+1/x3与x7+1/x7的值. 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 一道数学题:如果1+x+x2+x3=0,求x+x2+x3+x4+x5+x6+x7+x8的值 若x+y=1,x2+y2=2求x7+y7的值 若x+y=1,x2+y2=2求x7+y7的值 已知有一列数x1,x2,x3,...,x7,且x1=8,x7=5832,x1/x2=x2/x3=x3/x4=x4/x5=x5/x6=x6/x7=x7/x8,求x5的值, 1.如果1+X+X2+X3=0,求X+X2+X3+X4+X5+X6+X7+X8的值为?2.若a2+b2+4a-6b+13=0,求a的b次方的值为? (x7+px+q)(x2+2x-3)展开式中不含x2与x3项,求p与q的值 设x1,x2…x7为正整数,且x1＜x2…＜x7,且x1+x2...+x7=159,求x1+x2+x3的最大值 x8+x7+x6 +x5+x4+x3+x2+x+1因式分解 x8+x7+x6+x5+x4+x3+x2+x+1因式分解 已知：点（x,y）在直线y=-x+1上,且x2+y2=2,求x7+y7的值．x+y=1,为什么x2+y2也等于1喃 100x( 3/1x4 + 3/4x7 +3/7x10 +.3/97x100)=?注：1x4、4x7、7x10等均为分母的大小 数列1,x1,x2,...x7,5和数列1,y1,y2,...y6,5均成等差数列,公差分别是d1,d2,求d1/d2与x1+x2+...+x7/y1+y2+...+y6的值 Min Z= X1 +X2 +X3 +X4 +X5 +X6 +X7 +X8S.T.2X1 +X2 +X3 +X4 =1002X2 +X3 + 3X5 +2X6 + X7 =100X1 + X3 + 3X4 +2X6 +3X7 +4X8 =100X1,X2,X3,X4,X5 ,X6,X7,X8 >=0经过计算的最优解是X*= (40 ,20,0,0,0 ,30 ,0 ,0)T Z* =90但该解也是最优解X*= (10 ,50,0 已知方程组{x+y=5k-1 3x-2y=7的解满足x7的条件,求k的正整数值.