已知x²-x-1=0,求2007+2x-x³
人气:488 ℃ 时间:2020-03-15 19:41:37
解答
已知x²-x-1=0,即x²=x+1
2007+2x-x³
= 2007+2x-x*x²
= 2007+2x-x*(x+1)
= 2007+2x-x²-x
= 2007-x²+x
= 2007-1
= 2006
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