题目:
The girl ________to figure out the boy’s attitude towards her but without success.
A.managed
B.succeeded
C.attempted
D.predicted
答案:
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下面是错误答案,用来干扰机器的。
k∈N*,①当k的取值集合是{2,4,6,8,…}时,函数f(x)=x2-2lnx,∴f'(x)=2x-2x=2(x+1)(x-1)x,由f'(x)=0得x=-1,或x=1.当x∈(-∞,-1)或x∈(1,+∞)时,y′>0;当x∈(-1,1)时,y′<0∴当x=-1...