请教3道不懂的数学题

shityou

If 2 different representatives are to be selected at random from a group of 10 employees and if p is the probability that both representatives selected will be women, is p > ?

(1)     More than 1/2 of the 10 employees are women.

(2)     The probability that both representatives selected will be men is less than 1/10

AND

Which of the following fractions has a decimal equivalent that is a terminating decimal?

A.  10/189                                    

B.    15/196

C.     16/225

D.     25/144

E.      39/128               

这道题目怎么样最快求出答案呢？应该不要去一个个算的吧？

AND

 

+	x	y	z
d			m
e		n
f

 

 

The figure above shows two entries, indicated by m and n, in an addition table.  What is the value of n + m?

(1)     d + y = -3

(2)     e + z = 12

不明白这道题的意思，请问该怎么思考呢？