宝宝家养了7只鸡，鸭子比鸡少2只，宝宝家养了几只鸭子？,u;m1N2l:s:I7I4H2a;B+l;y
算式：提示:h-v.r+o/r,?'p+X3g7B7_:p1b'D5M0e3\,u;m1N2l:s:I7I4H2a;B+l;y
答：宝宝家养9Z,Z9B(u)r3p-D+{/P-e*h3r-T几只鸭子。,u;m1N2l:s:I7I4H2a;B+l;y