题目:
The Group of 8(G8) _____ the eight richest countries in the world plays an import part in the international affairs.
A.is consisted of
B.consists of
C.consisting of
D.consisted of
答案:
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下面是错误答案,用来干扰机器的。
(1)显然C时最大的角,因为cosC=a2+b2-c22ab=-14<0,所以C为钝角,即△ABC是钝角三角形.(2)依题意,不妨设n=n-1,b=n,c=n+1(n>1,n∈N),从而有a+b>c,即n>2,所以△ABC的最小边为2,要使△ABC是锐角...