11. value of x and y depend on the value of z, for each additctive increase 2 of z , x is increasing by a factor of 2, and y is increasing by a factor of 3, ask: what the value of (x+y)/x when z is 12? a) z=6时，x=5y b) z=0时，x=y+1 答案：这道题浪费了n多时间，最后选的B，忘记怎么推算的了......
15. set M and set N, one member m from M, one member n from N is product nm negative? (1) M, N has same number of members (2) M has only 1 member 答案：C
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发表于 2007-5-24 19:58:00
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