guess as many times as you can.

guess as many times as you can.
A+B = 250
A-B = 20 guess A, B
The way her teacher says; choose a number eg. choose A = 40
then A(40) + 20 (the difference) = B (60), A+B = 40 + 60 << 250,
continue to choose another A = 50,... keep guessing...

所有跟帖： 

• 这题也不是guess。而是thinking and trying.还得算。 -三月花开- ♀ (0 bytes) () 09/19/2007 postreply 13:07:44