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1,a+b,a中有個數為0 那麼可能是a+b=0或a=0 但若a=0,b/a則無意義.所以a+b=0 再看0,b/a,b中有一個為1 顯然由a+b=0得b/a=-1 所以只可能b=1 這時全部算出,a=-1,b=1 所以b-a=2
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