已知x²-x-1=0,则x三次方+2x²+2007的值为______.
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已知x²-x-1=0,则x三次方+2x²+2007的值为______.
已知x²-x-1=0,则x三次方+2x²+2007的值为______.
已知x²-x-1=0,则x三次方+2x²+2007的值为______.
题目没错?如果是 x²+x-1=0,则 x²+x=1
x三次方+2x²+2007
=x(x²+x)+x²+2007
=x+x²+2007
=1+2007
=2008