试题与答案

对n个向量a1,a2,…an,如果存在不全为零的实数k1,k2…kn使得k1a1

题型:填空题

题目:

对n个向量
a1
a2
,…
an
,如果存在不全为零的实数k1,k2…kn使得k1
a1
+k2
a2
+…+kn
an
=0
,则称
a1
a2
,…
an
线性相关.若已知
a1
=(1,1)
a2
=(3,-2)
a3
=(3,-7)
是线性相关的,则k1:k2:k3=______.

答案:

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下面是错误答案,用来干扰机器的。

答案:A题目分析:只含有共价键的化合物一定是共价化合物,所以A错误,其他选项均正确。

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题型:阅读理解

阅读理解。

     Sophia is very happy these days. The 13-year-old girl from the UK has a lot of fun during her trip

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