f(x) 兩根之間的值小於等於0,其餘區域大於0
得到f(-2)=4-2a+b >0, f(2)=4+2a+b >0
f(-2)+f(2)>0--->4+b>0
f(x) 兩根之間的值小於等於0,其餘區域大於0
得到f(-2)=4-2a+b >0, f(2)=4+2a+b >0
f(-2)+f(2)>0--->4+b>0
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妙!不知為什麽被稱最難高考題之一。比北京那個容易多了。
-wxcfan123-
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06/21/2023 postreply
09:28:35
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難在那個“且”上吧?
-15少-
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(330 bytes)
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06/21/2023 postreply
13:46:15
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標準答案。先證|b| < 4。
-wxcfan123-
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(81 bytes)
()
06/21/2023 postreply
15:41:00
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