2. There are two piles of glass balls, A and B. A gives B 1, 7, which means the two piles are equal. So B is 5/7 of A?
3. A glass of milk, Xiao Zhao drank half a cup for the first time and the remaining half a cup for the second time, so she always drank the remaining half a cup. She drank 3 1/32 cups of milk five times.
4. A glass of pure fruit juice, Liu Liu drank 1 for the first time, filled the glass with water, and then drank 1 for the fourth time, leaving 9/ 16 pure fruit juice.
5. On the whole, 1 students are good at Chinese, 1 students are good at math and 1 students are good at foreign languages, accounting for 1 students.