求简便算法If x2 - 3x + 1 = 0, what is the value of x2 + (1/x)2 ?

求简便算法If x2 - 3x + 1 = 0, what is the value of x2 + (1/x)2 ? if 3 more than x is 2 less than 9 ,what is the value of x if cos(1/2)x=(√5)/4 what is the value of cos^2x?1)1/64 2)1/4 If x is positive what is the least value of x+16/x 8.If 6 < |x-3| < 7 and x < 0,what is one possible value of | 已知x2+3x-1=0,求x2+1/x2+2x-2/x的值 5x2-3x-5=0,求5x2-2x-1/(5x2-2x)＝多少? if 5 more than x is equal to 10,what is the value of SAT数学题, what is the value of 3+(-3) what is the value of (-10.4) + 1 已知x^2-3x+1=0求√x2+1／x2-2的值 已知x2+x-1=0，求2x3+3x2-x的值． 已知X的平方-3X+2=0,求x2+X2分之1的值