9+3={#blank#}1{#/blank#}

9+6={#blank#}2{#/blank#}

9+2={#blank#}3{#/blank#}

8-5={#blank#}4{#/blank#}

9－2＝                      6＋4＝                    9＋1＝                      1＋1＝                      9－9＝

5＋5＝                    10－1＝                    2＋6＝                      9－7＝                      10－3＝

8－4＝                      6－3＝                      8＋1＝                      5－1＝                      8＋2＝

6＋3＝                      7＋3＝                    10－5＝                    0＋0＝                      3－2＝

有9只兔子，外面有只兔子，笼子里有几只兔子？