MATH JJ 04-1-78

jglsogi

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?

THANK YOU VERY MUCH , EVERYBODY!~

topway5

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

jglsogi

明白了，谢谢！！