有12袋白糖，其中11袋的质量相同，另一袋稍轻一点，如果用天平称，至少称几次可以找出这袋较轻的白糖？
计算．×9=×0= 0÷=÷= 12×=×=÷=÷=
直接写得数×=÷5=×12=×=÷=÷=×= 1÷== 45×=÷2=÷=×=÷=×0=×= 1﹣=÷=×= 15÷=
口算×6=+=×=×6=÷=÷= 1﹣=﹣=×4=÷=
直接写得数．×= 0×=÷=÷4= 12÷= 0.3×=×÷×= 0×+=
直接写出得数 21×=÷2=×=÷=÷= 12÷= 1÷=×0=
×9=
×0= 0÷
=
÷
=
×
=
÷
=
÷
=
×
=
÷5=
×12=
×
=
÷
÷
=
×
= 1÷
=
= 45×
=
÷2=
÷
=
×
=
=
×0=
×
= 1﹣
=
÷
=
×
= 15÷
=
×6=
+
=
×
=
×6=
÷
=
÷
= 1﹣
=
﹣
=
×4=
÷
=
×
= 0×
=
÷
=
÷4= 12÷
= 0.3×
=
×
÷
×
= 0×
+
=
=
÷2=
×
=
÷
=
÷
= 12÷
= 1÷
=
×0=
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