张大伯家养了18只鸭，养鸡的只数是鸭的2倍，张大伯家养鸡和鸭一共多少只？)Y'c.C'|8o5@3F+k8q1c9P:G9k
算式：提示)L+J5Q:Q2g(@9g2s7D1E2B)Y'c.C'|8o5@3F+k8q1c9P:G9k
答：鸡鸭共8z9y1I+{(])N+]6p3B)^2R2W.W5I只。)Y'c.C'|8o5@3F+k8q1c9P:G9k