184. If each of the positive integers a, b, and c is a prime number and abc=30, what is the value of c? (1) a<b<c (2) a+b=c 答案是D,我选B, 请问1算不算质数啊???
148. The figure 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 答案是C,这题我根本没看懂。。。 求高人翻译并解答,谢谢~~~