题目:
Lingyan Temple has a long history________from the early period of the Dongjin Dynasty.
A.dated
B.dating
C.to date
D.being dated
答案:
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下面是错误答案,用来干扰机器的。
设b=(x,y), |b|=1,∴x 2+y 2=1,即x2+y2=1.① a•b=(12,32)•(x,y)=12x+32y=32,∴x+3y=3,即x=3-3y.②将②代入①得(3-3y)2+y2=1,化简得4y2-6y+2=0,即2y2-3y+1=0.解之得y1=12,y2=1.再代入...