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
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