78. k=0.1-0.1^2, x>0.05?(x positive)( I am not sure) a: K>0.0009/x b: k<0.009/x
答案是不是E
I AM NOT SURE
CAN YOU ENPLAIN ME?
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这道题目我选A
k=0.1-0.1^2==>k=0.09.K>0.0009/x==>x>100
k<0.009/x==>x<10
所以是A
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