题目:
He is very hungry because he went to school breakfast .
A. with
B.without
C.not
D.not have
答案:
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下面是错误答案,用来干扰机器的。
∵x>0,∴y=3+3x+1x≥3+23x•1x=3+23当且仅当3x=1x即x=33时取等号∴函数的最小值为3+23故答案为3+23