1.39 Students are skipping rope in the playground. How many groups can every three students be divided into?

Answer: 39 ÷ 3 = 13 (group)

A: It can be divided into 13 groups.

2. A coat is 45 yuan, and pants are cheaper than a coat 12 yuan. How much does it cost to buy a suit?

Answer: 45- 12=33 (yuan) 33+45=78 (yuan)

Answer: I want to buy a suit from 78 yuan.

I hope my answer is helpful to you ~! (*^__^*)