有10个小朋友排成一列，要从中选出3个互不相邻的小朋友，有多少种不同的选法？
直接写出计算结果．== 8×= 12=== 2﹣= 1=
直接写出得数． 3×=÷0.5= 9÷=÷﹣= （1﹣）÷= 2÷×=
直接写得数．×6= 30×=÷= 20÷=+=××0=×= 1÷×= 5.6÷0.08= 39××=
直接写得数．﹣=÷=×=×= 10×=×=÷=÷= 15×=÷=+=÷22=
直接写出得数．=========．
=
= 8×
= 12
=
=
= 2﹣
= 1
=
=
÷0.5=
=
÷
﹣
）÷
×
=
×6= 30×
=
÷
= 20÷
=
+
=
×
×0=
×
= 1÷
=
×
=
﹣
=
÷
=
×
=
×
= 10×
=
×
=
÷
=
÷
= 15×
=
÷
=
+
=
÷22=
=
=
=
=
=
=
=
=
=
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