【费费数学】第一部分（11-15）

aimhigh715

Where can I get the 【费费数学】 version without answers? Download section only has the complete question + answer ones...?

Thanks!

sausau

11题的思路11楼写得很对

这个和prep

In the xy-plane, does the line with equation y = 3x + 2 contain the point (r, s) ? (1) (3r + 2 - s)(4r + 9 - s) = 0 (2) (4r - 6 - s)(3r + 2 - s) = 0

是不一样的。所以应该选e

[此贴子已经被作者于2008-12-3 6:16:46编辑过]