英文解释看不懂......请指教!
239.If n is an integer between 2 and 100 and if n is also the square of an integer, what is the value of n?
(1)n is even. (2)The cube root of n is an integer
A):B
236.Is |x|=y-z?
(1)x+y=z (2)x<0
A):C
234.If x is a positive integer and w is a negative integer, what is the value of xw?
(1)xw-1/2 (2)w=-1
A):A
233.If x ≠ -y, is (x-y)/(x+y)>1?
(1)x>0 (2)y<0
A):E
224.If x is a positive number less than 10, is z greater than the average (arithmetic mean) of x and 10?
(1)On the number line, z is closer to 10 than it to x. (2)z=5x
A):A
218.If n is a positive integer, is the value of b-a at least twice the value of 3n-2n ?
(1)a=2n+1 and b=3n+1 (2)n=3
A):A
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X Y
If the successive tick marks shown on the number line above are equally spaced and if x and y are the numbers designating the end points of intervals as shown, what is the value of y?
(1)x=1/2 (2)y-x=2/3
A):D