tt-math-22-21

winniebxf

    

Q21:

    

If x and y are positive integers, what is
the value of (x+y)²?

    

(1)   x = y - 3

    

(2) x and y are
prime numbers.

    

                  

    

A. Statement (1) ALONE is sufficient,
but statement (2) alone is not sufficient.

    

B. Statement (2) ALONE is
sufficient, but statement (1) alone is not sufficient.

    

C. BOTH statements TOGETHER
are sufficient, but NEITHER statement ALONE is sufficient.

    

D. EACH statement ALONE is
sufficient.

    

E. √Statements (1) and (2) TOGETHER are NOT sufficient.

答案是C。可是我怎么也找不出两个质数符合  x = y - 3。谢谢指教

winniebxf

奇怪，前面怎么是一堆乱码？
将就这看吧。。。嘻嘻

Tracylee03

呵呵...是一堆乱码. X=2, Y=5

winniebxf

谢谢
我太粗心了
就是基本功不到啊！！