x²-3x+1=0,则x²+x²分之1的值
来源:学生学帮网 编辑:学帮网 时间:2024/06/27 22:20:26
x²-3x+1=0,则x²+x²分之1的值
x²-3x+1=0,
x≠0,上式两边同除以x,得x-3+1/x=0
x+1/x=3
x²+1/x²
=(x+1/x)²-2
=3²-2
=7
x²-3x+1=0,则x²+x²分之1的值
x²-3x+1=0,
x≠0,上式两边同除以x,得x-3+1/x=0
x+1/x=3
x²+1/x²
=(x+1/x)²-2
=3²-2
=7