11矩阵乘法P107 例5-6 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * = & & & & & & & & & & & & X Y Z Option base 1 Private sub form_click) Dim X(4,5,Y(5,3,Z(4,3) For I=1 to 4 for j=1