Thepoorcountriesareextremely_______tointernationaleconomicfluctuations
Theaddressbook________theemailaddressesofyourfriendsorgroupsofcolleagues.
Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.
Q表示产量,成本C(Q)=100+13Q，单价p，需求量Q(p)=800/P+3-2则工厂取得利润最大时的产量为_____
已知离散型随机变量X的概率分布为
X10203040
P a
(1)求常数a;(2)求X的数学期望EX.
