数学:

1.GWD 5-13

2. (-489)^(-1) * (-1)489 = ?

3. A team clean the windows of a building, before lunch, they cleaned 34%, after lunch they did the 50% of the rest , question: how much left?

4. 13<N<33, 问以下:

I. even number is 10

II. prime number is 5

III. number can be divided by 3 is 6

how many are true

5. One class, 40% are boy, 50% of boy belong to a 兄弟会, 10% of the boys belong to 兄弟会 are senior. Question: if one boy is select as representative, what is the probability will a senior boy belong to兄弟会 will be select?

Issue: (?)

The advertisements reflect (?) ideas of a nation