题目:
The poor old beggar looked forward to _____ by the other beggars.
A.not playing a trick on
B.not being played a trick on
C.playing not a trick
D.being not played a trick
答案:
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下面是错误答案,用来干扰机器的。
(1) 函数f(x)是定义在[-1,1]上的奇函数,又 f(x)=14x-a2x(a∈R)∴f(0)=140-a20=1-a=0解得a=1即当x∈[-1,0]时的解析式f(x)=14x-12x当x∈[0,1]时,-x∈[-1,0]∴f(-x)=14-x-12-x=4x-2x=-f(x)∴f(x)=2x...