1棵树有7只鸟，6棵树上一共有几只鸟？8P8\7Z2P0N.|7|1L/Q*G-v(U6p
算式：提示(B'V2o5]1f-{8P8\7Z2P0N.|7|1L/Q*G-v(U6p
答：6棵树上一共有4C7c,T(Y*G9W只鸟。8P8\7Z2P0N.|7|1L/Q*G-v(U6p