GWD MATH 28 Q33&Q34 求教~~

viridian

Q33:
150, 200, 250, n


Which of the following could be the median of the 4 integers listed above?


I.175
II.215
III.235




A.I only

B.II only
C.I and II only

D.II and III only

E.I, II, and III

Answer: C
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Q34:
The operation Θ is defined by x Θ y =
1/x +1/y for all nonzero numbers x and y.If z is a number greater than 1, which of the following must be true?



I.x Θ (-z) = 0      
II.z Θ (z/z-1)= 1
III.  (2/z)Θ  (2/z)= z


第二个和第三都轻松带入都可以得到答案..第一个由于-Z<0.。不知道该怎么处理了..= =!! 望NN解答~

viridian

viridian

Q33有人可以解答咩~~~~

viridian

谢谢大家！！