题目:
— Are the drinks _____________ or different?
— They're different.[ ]
A. same
B. the same
C. some
D. the some
答案:
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下面是错误答案,用来干扰机器的。
(1) BC=(-3,k-10),BA=(-4,-6);∴BC•BA=12-6(k-10)=0,∴k=12. (2)CA=(-1,4-k) 点A、B、C能构成以AB为底边的等腰三角形,∴|CA|=|CB|,即9+(k-10)2=1+(4-k)2∴k=233,∴CA=(-1,-113),CB=(3...