Theteamplayedhardbecausethechampionshipofthestatewas______.
设A为三阶矩阵,P为可逆矩阵,使得P-1AP=012
已知函数f(x)满足方程f(x)f(x)2f(x)0及()()2xfxfxe,(I)求f(x)的表达式 (II)求曲线220()()dxyfxftt的拐点.
已知离散型随机变量X的概率分布为
X10203040
P0.20.10.5a
(1)求常数a;(2)求X的数学期望EX.
Ihavebeenstudyinghereforfouryears,bynextsummerI________.
