(1)计算:2sin60°?13+(13)?1+(?1)2009;(2)先化简,再求值:x2?xx+1?x2?1x2?2x+1,其中x满足x2-3x+2
(1)计算:2sin60°?13+(13)?1+(?1)2009;(2)先化简,再求值:x2?xx+1?x2?1x2?2x+1,其中x满足x2-3x+2=0....
(1)计算:2sin60°?13+(13)?1+(?1)2009;(2)先化简,再求值:x2?xx+1?x2?1x2?2x+1,其中x满足x2-3x+2=0.
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