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作出y=x²;-4x+3的影像:這是開口向上的抛物線,與x軸的交點是(1,0)、(3,0),再將得到的抛物線位於x軸下方的部分翻折到x軸上方,這樣,反折得到的影像與原來就在x軸上方的部分就組成函數y=|x²;-4x+3|的影像.
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