小朋友排队,小红前面4个人,后面3个人,问这队共有几个人?5N;a5g0V2z:t1i.j5O)^.D;c
算式:提示'u(H'Y0D3M1a8n2i*P*\1M5N;a5g0V2z:t1i.j5O)^.D;c
口答:这队共有:p(^/Q1J3b;t5J1d1J个人。5N;a5g0V2z:t1i.j5O)^.D;c