11基础夯实第6题答案
450
12基础夯实第7题答案
(1)0.8,0.95,0.88,0.93,0.89,0.9006,0.899,0.901
(2)略
(3)略
13基础夯实第8题答案
(1)0.5069,0.5016,0.5005
(2)1/2
14能力提高答案
40%,60%;40个