(1).已知((X,Y))的联合分布律为则(X)与(Y)相互独立。[qquadqquadqquad{begin{array}{c|cc}{XbackslashY}&0&1hline0&{frac{3}{10}}&{frac{3}{10}}1&{frac{3}{10}}&{frac{1}{10}}end{array}}]