学校举办羽毛球比赛，班里有四个人想参加，可是名额只有两个人，有多少种组队方案？
①=②=③= ④= ⑤= ⑥=⑦=⑧= ⑨= ⑩= ．
直接写出得数．+=﹣= 3×=÷=+=÷= 1﹣=×=
直接写出得数．==== 2÷3====
+=﹣=×= 14÷=÷=×=÷= 6×=
直接写得数： 1﹣= 9×=÷2=÷== 1=×1.3=×=
=②
=③
= ④
= 
= ⑥
=⑦
=⑧
= 
= ⑩
= ．
+
=
﹣
=
÷
=
+
=
÷
= 1﹣
=
×
=
=
=
=
=
=
=
=
+
=
﹣
=
= 14÷
=
÷
=
×
=
÷
= 6×
=
= 9×
=
÷2=
÷
= 1
=
×1.3=
×
=
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