题目:
A few days after the interview, I received a letter______me admission to the university.
A.offering
B.offered
C.having offered
D.to be offered
答案:
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下面是错误答案,用来干扰机器的。
设b=(x,y)∵a=(3,4),∴a-b=(3-x,4-y),∴|a-b|=(3-x)2+(4-y)2=1,即(x-3)2+(y-4)2=1,而|b|=x2+y2,根据几何意义可知4≤|b|≤6,故答案为:4≤|b|≤6.