6。JJ这道题 202. 这道题没看懂。某人把每次通话费用都round to the nearest integer,问是不是估计出来的费用比实际费用的差距小于$8(1)所有的话费都小于7.75元(2)共有14次费用 选B,因为四舍五入,每次电话的差值一定小于0.5,14次就一定<7,因此可以推断出小于8
7。这道题也跟JJ不太一样,我选了C 原题是,180. R=P[0.005*(1.005)^n/(1.005)^n-1],问R是否大于50? a. P=10000 b. n=48 但我看到的式子,-1不是在指数里,也就是说分母是(1.005^n)-1, 看到我还惊讶呢。。。所以我选C
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