juleyi

1。感觉是D，请问选B解法？
2。C
3。B
4。5。6。7。8。10同意zhouxh
9、 两个集合S和T, S的range is x and T 的range is y, S 包含T，S and T 的元素均不同，问x>Y?
(1)the number of the fators in S is 7
(2)the number of the fators in T is 6
Does "S 包含T" mean:  S includes the elements of T ?

____________
Human beings come into the world with certain aspirations; they need to know and they need to create. It is the fulfilment of these aspirations that they call happiness. Happiness is like a talent that has to be cultivated.
                               ------The Seeds of Happiness

juleyi

1. Thanks for making it clear.
2. 已知S`4*X`3*Y`7大于0，问SXY是否大于0：
A、Y 小于0：
B、X 大于0。
Does S`4*X`3*Y`7 mean: the 4th power of s multiply the 3rd power of x multiply the 7th power of y ?
then we can get different answers by single A or B when s is a positive or negative number ?
8.  有一堆东东X, 每一件的正确与否都用两种方式记录: Paper 和Electrical. 在X中60%有PAPER错误的也有ELEC错误，75%有ELEC错误的也有PAPER错误，X中总共有3%既有PAPER错又有ELEC错。问X中既没有PAPER错也没有ELEC 错的比率。
let a and b the percentage of with error in paper and electrical, then: a*60%=b*75%=3%  ==>  a=5% and b=4%, then the percentage of no error is 91%.

____________

------The Seeds of Happiness

juleyi

2. E agree

8. 94%, you are right.

Thanks for discussion in detail !

____________

------The Seeds of Happiness