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Winter vacation homework (Qingdao Edition Mathematics 4)
1. Xiaohong =(33-6)/3=9 years old.

2. 1 class =(83-3)/2=40 people.

Class 2 =83-40 people =43 people

3. 105/5=2 1 These five numbers are 19 20 2 1 22 23.

4. 1、2、3、4、5、6......(n- 1 ), n ,( n+ 1 ).

5. Oil = (34- 19) * 2 = 30kg.

One bottle =34-30=4 kg

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