Ai,...this kind of questions is too easy for me. I have teached math in U near 40 years...
Sir,b is comlex number,you are too...
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Let's skip this...... though a little competition is good. Jing
-乱弹-
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07/17/2011 postreply
18:07:29
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(cont), maybe you can post some new problems.
-乱弹-
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07/17/2011 postreply
18:08:01
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yes, let's skip this...... it is becoming boring
-15少-
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07/18/2011 postreply
05:39:40