be divided by

be divided by
被..除

Twenty can be divided by four.
20能被4除。
Twelve can be divided by three.
12可以用3除尽。

be divided into
被分为

The stomach can be divided into fundus, body, and antrum
胃可分为底部，体部和窦部。

1.被什么分开 The people were divided by the police.
1.被分成 The students were divided by the teacher into 4 groups.

1.divide by 用...除(尽) , 因...分裂

2.divide into 被分成

1，被……除 例如：6 is divided by 3 equals 2.
2，被分成 例如：our team was divided into two groups。

同上，跟Ariel_wenqi的回答一样，他对