1. -22. 15 3. (4,9)4. A逆：第一行(1/2, 0)，第二行(0,1/3)，|3A| = 545. {5}6. P(B|A) = P(AB) / P(A) = 0.3 / 0.5 = 0.6； P(A|B) = P(AB) / P(B) = 0.3 / 0.6 = 0.5.7. E(X) = 1，D(X) = 2 正态分布N(a, σ^2)二、(1)、-1
