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非常高興能回答的問題理解方法1:當2個符號相除時,按照規律,它的最後符號應該和這2個數乘積的符號相同.如(x+y)除以(a+b)小於0,那麼(x+y)乘以(a+b)也一定小於0,那麼按照正負得負,所以(x+y)/(a+b)也小於0理解方法…
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