若x²-3x+1=0,计算x²+1/x²+3的值

若x²-3x+1=0,计算x²+1/x²+3的值
若x²-3x+1=0,计算x²+1/x²+3的值

若x²-3x+1=0,计算x²+1/x²+3的值
x^2 - 3x + 1=0 (divide x)
x - 3 + (1/x) =0
x+ (1/x) = 3
x^2 + (1/x^2 ) = (x + (1/x) )^2 -2 =3^2 -2 =7
therefore,
x^2 + (1/x^2 ) + 3 = 7 + 3 =10

x+2-4x+5=0

x的2次方+1=3x，x2+3=3x-2，3x/3x-2.我只能帮这么多了。