李大爷家养鸭18只，养鸡38只，养鹅的只数是鸡与鸭只数和的一半。李大爷家养了多少只鹅？,d9\(W0C8D*g:o(o8g
算式：提示5_6?+u*Q(U,d9\(W0C8D*g:o(o8g
答：李大爷家养了9C-O;b(C只鹅.,d9\(W0C8D*g:o(o8g