回复：那就猜，怎么会弄到半夜？一共给猜几次？

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： 

• 不错啊，这个是接近法 -britannica- ♀ (42 bytes) () 09/19/2007 postreply 13:00:58

• 这么接近法子，是不可能发现a+b+(a-b)=2a, a+b-(a-b)=2b的规律所在 -云槎- ♀ (138 bytes) () 09/19/2007 postreply 13:32:14