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27個 因為函數值2對應引數有三種方法分別是1;-1;1,-1 函數值5對應引數有三種方法分別是2;-2;2,-2 函數值10對應引數有三種方法分別是3;-3;3,-3 所以函數個數為3乘3乘3=27
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