在729个小轴承中有一个次品，次品比合格轴承轻，其余重量相同，现在用一架无法码天平最少称几次就一定能称出这个次品？
直接写得数．×0=×=×12=×= 45×=÷=×=÷= 18×=×= 1÷=÷=
直接写出得数．×12=÷=（ ）2= 4﹣4×= 1×= 43÷=÷=×8+×8= 0.9×= 12×﹣=×7÷×7==
直接写出得数．÷= 0×=÷=÷1=÷= 1+=×=×=
直接写出得数． 12×=+=÷8=﹣=
直接等结果×1=﹣= 0.25×0.4=÷= 5+5= 16×（﹣）= 4×25%=÷4=
×0=
×
=
×12=
×
=
=
÷
=
×
=
÷
=
=
×
= 1÷
=
÷
=
×12=
÷
=（ 
）2= 4﹣4×
= 1
×
= 43÷
=
÷
=
×8+
×8= 0.9×
= 12×
﹣
×7÷
=
÷
=
÷
=
÷1=
÷
= 1+
=
×
=
×
=
=
+
÷8=
﹣
=
×1
=
﹣
= 0.25×0.4=
÷
=
= 16×（
﹣
）= 4×25%=
÷4=
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